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is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Qin%2C+J&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Qin%2C+J&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Qin%2C+J&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Qin%2C+J&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.15497">arXiv:2501.15497</a> <span> [<a href="https://arxiv.org/pdf/2501.15497">pdf</a>, <a href="https://arxiv.org/ps/2501.15497">ps</a>, <a href="https://arxiv.org/format/2501.15497">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/adaa0f">10.1088/1367-2630/adaa0f <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Bi-Josephson Effect in a Driven-Dissipative Supersolid </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+S">Shijie Li</a>, <a href="/search/cond-mat?searchtype=author&query=Tu%2C+Y">Yijia Tu</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+M">Maokun Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Guan%2C+L">Lin Guan</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+W">Weimin Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lu Zhou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.15497v1-abstract-short" style="display: inline;"> The Josephson effect is a macroscopic quantum tunneling phenomenon in a system with superfluid property, when it is split into two parts by a barrier. Here, we examine the Josephson effect in a driven-dissipative supersolid realized by coupling Bose-Einstein condensates to an optical ring cavity. We show that the spontaneous breaking of spatial translation symmetry in supersolid makes the location… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.15497v1-abstract-full').style.display = 'inline'; document.getElementById('2501.15497v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.15497v1-abstract-full" style="display: none;"> The Josephson effect is a macroscopic quantum tunneling phenomenon in a system with superfluid property, when it is split into two parts by a barrier. Here, we examine the Josephson effect in a driven-dissipative supersolid realized by coupling Bose-Einstein condensates to an optical ring cavity. We show that the spontaneous breaking of spatial translation symmetry in supersolid makes the location of the splitting barrier have a significant influence on the Josephson effect. Remarkably, for the same splitting barrier, depending on its location, two different types of DC Josephson currents are found in the supersolid phase (compared to only one type found in the superfluid phase). Thus, we term it a bi-Josephson effect. We examine the Josephson relationships and critical Josephson currents in detail, revealing that the emergence of supersolid order affects these two types of DC Josephson currents differently -- one is enhanced, while the other is suppressed. The findings of this work unveil unique Josephson physics in the supersolid phase, and show new opportunities to build novel Josephson devices with supersolids. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.15497v1-abstract-full').style.display = 'none'; document.getElementById('2501.15497v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 27 013015 (2025) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.04800">arXiv:2409.04800</a> <span> [<a href="https://arxiv.org/pdf/2409.04800">pdf</a>, <a href="https://arxiv.org/ps/2409.04800">ps</a>, <a href="https://arxiv.org/format/2409.04800">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/jacs.4c04910">10.1021/jacs.4c04910 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> FePd2Te2: An Anisotropic Two-Dimensional Ferromagnet with One-Dimensional Fe Chains </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Shi%2C+B">Bingxian Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Geng%2C+Y">Yanyan Geng</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hengning Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+J">Jianhui Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Shang%2C+C">Chenglin Shang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Manyu Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Mi%2C+S">Shuo Mi</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+J">Jiale Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+F">Feihao Pan</a>, <a href="/search/cond-mat?searchtype=author&query=Gui%2C+X">Xuejuan Gui</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+J">Jinchen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+J">Juanjuan Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+D">Daye Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+H">Hongxia Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jianfei Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hongliang Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Hao%2C+L">Lijie Hao</a>, <a href="/search/cond-mat?searchtype=author&query=Tian%2C+M">Mingliang Tian</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+Z">Zhihai Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+G">Guolin Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+P">Peng Cheng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.04800v1-abstract-short" style="display: inline;"> Two-dimensional (2D) magnets have attracted significant attentions in recent years due to their importance in the research on both fundamental physics and spintronic applications. Here, we report the discovery of a new ternary compound FePd2Te2. It features a layered quasi-2D crystal structure with one-dimensional Fe zigzag chains extending along the b-axis in the cleavage plane. Single crystals o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.04800v1-abstract-full').style.display = 'inline'; document.getElementById('2409.04800v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.04800v1-abstract-full" style="display: none;"> Two-dimensional (2D) magnets have attracted significant attentions in recent years due to their importance in the research on both fundamental physics and spintronic applications. Here, we report the discovery of a new ternary compound FePd2Te2. It features a layered quasi-2D crystal structure with one-dimensional Fe zigzag chains extending along the b-axis in the cleavage plane. Single crystals of FePd2Te2 with centimeter-size could be grown. Density functional theory calculations, mechanical exfoliation and atomic force microscopy on these crystals reveal that they are 2D materialsthat can be thinned down to 5 nm. Magnetic characterization shows that FePd2Te2 is an easy-plane ferromagnet with Tc 183 K and strong in-plane uniaxial magnetic anisotropy. Magnetoresistance and anomalous Hall effect demonstrate that ferromagnetism could maintain in FePd2Te2 flakes with large coercivity. A crystal twinning effect is observed by scanning tunneling microscopy which makes the Fe chains right-angle bent in the cleavage plane and creates an intriguing spin texture. Our results show that FePd2Te2 is a correlated anisotropic 2D magnets that may attract multidisciplinary research interests. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.04800v1-abstract-full').style.display = 'none'; document.getElementById('2409.04800v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J.Am.Chem.Soc.2024,146,21546-21554 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.18875">arXiv:2406.18875</a> <span> [<a href="https://arxiv.org/pdf/2406.18875">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Design of ANF/MXene/SSG sandwich structure with electromagnetic shielding performance and impact resistance </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+K">Kai Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+C">Chiyu Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jianbin Qin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.18875v1-abstract-short" style="display: inline;"> Since entering the information era, electronic devices gradually play an important role in daily lives. However, the abuse of electronic devices leads to corresponding electromagnetic EM wave pollution. The complex external environment causes the potential for physical impact. In this work, an ANF MXene SSG flexible sandwich structure was fabricated according to methods of vacuum filtration, direc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.18875v1-abstract-full').style.display = 'inline'; document.getElementById('2406.18875v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.18875v1-abstract-full" style="display: none;"> Since entering the information era, electronic devices gradually play an important role in daily lives. However, the abuse of electronic devices leads to corresponding electromagnetic EM wave pollution. The complex external environment causes the potential for physical impact. In this work, an ANF MXene SSG flexible sandwich structure was fabricated according to methods of vacuum filtration, directional freeze-casting solidification, and polyurethane encapsulation. Apart from its excellent protection function, the sandwich structure also acts as a human body movement sensor. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.18875v1-abstract-full').style.display = 'none'; document.getElementById('2406.18875v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.06741">arXiv:2401.06741</a> <span> [<a href="https://arxiv.org/pdf/2401.06741">pdf</a>, <a href="https://arxiv.org/ps/2401.06741">ps</a>, <a href="https://arxiv.org/format/2401.06741">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevMaterials.8.074006">10.1103/PhysRevMaterials.8.074006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic properties of van der Waals layered single crystals DyOBr and SmOCl </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pan%2C+F">Feihao Pan</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+D">Daye Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+S">Songnan Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+J">Jiale Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Shang%2C+C">Chenglin Shang</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+B">Bingxian Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Gui%2C+X">Xuejuan Gui</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jianfei Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hongliang Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Hao%2C+L">Lijie Hao</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+J">Jinchen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+J">Juanjuan Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+H">Hongxia Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+P">Peng Cheng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.06741v2-abstract-short" style="display: inline;"> Two-dimensional van der Waals single crystals DyOBr and SmOCl have been grown by flux method and their anisotropic magnetic properties are reported. DyOBr orders antiferromagnetically at T$_{N}$=9.5 K with magnetic moments lying along $a$-axis, similar as DyOCl. Its magnetic susceptibility shows an anomaly at T$^{*}$=30 K possibly due to the crystal field effect. Furthermore a 1/3 magnetization pl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.06741v2-abstract-full').style.display = 'inline'; document.getElementById('2401.06741v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.06741v2-abstract-full" style="display: none;"> Two-dimensional van der Waals single crystals DyOBr and SmOCl have been grown by flux method and their anisotropic magnetic properties are reported. DyOBr orders antiferromagnetically at T$_{N}$=9.5 K with magnetic moments lying along $a$-axis, similar as DyOCl. Its magnetic susceptibility shows an anomaly at T$^{*}$=30 K possibly due to the crystal field effect. Furthermore a 1/3 magnetization plateau is clearly observed under H$\parallel$a and H$\parallel$[110], which might be a field-induced spin-flop phase or some exotic quantum magnetic state. On the other hand, isostructural SmOCl undergoes an antiferromagnetic transition at T$_{N}$=7.1 K and exhibits a contrasting Ising-like perpendicular $c$-axis magnetic anisotropy, which could be well explained by our crystal field calculations. Both DyOBr and SmOCl are insulators with band gap of $\sim$5 eV, our results suggest they are promising in building van der Waals heterostructures and applications in multifunctional devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.06741v2-abstract-full').style.display = 'none'; document.getElementById('2401.06741v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.08162">arXiv:2311.08162</a> <span> [<a href="https://arxiv.org/pdf/2311.08162">pdf</a>, <a href="https://arxiv.org/ps/2311.08162">ps</a>, <a href="https://arxiv.org/format/2311.08162">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> </div> <p class="title is-5 mathjax"> Bright solitons in a spin-orbit-coupled dipolar Bose-Einstein condensate trapped within a double-lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Q">Qi Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+J">Junjie Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+L">Lu Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Y">Yingying Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lu Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+X">Xuejing Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+C">Chunjie Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Zunlue Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+W">Wuming Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+X">Xingdong Zhao</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.08162v1-abstract-short" style="display: inline;"> By effectively controlling the dipole-dipole interaction, we investigate the characteristics of the ground state of bright solitons in a spin-orbit coupled dipolar Bose-Einstein condensate. The dipolar atoms are trapped within a double-lattice which consists of a linear and a nonlinear lattice. We derive the motion equations of the different spin components, taking the controlling mechanisms of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.08162v1-abstract-full').style.display = 'inline'; document.getElementById('2311.08162v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.08162v1-abstract-full" style="display: none;"> By effectively controlling the dipole-dipole interaction, we investigate the characteristics of the ground state of bright solitons in a spin-orbit coupled dipolar Bose-Einstein condensate. The dipolar atoms are trapped within a double-lattice which consists of a linear and a nonlinear lattice. We derive the motion equations of the different spin components, taking the controlling mechanisms of the diolpe-dipole interaction into account. An analytical expression of dipole-dipole interaction is derived. By adjusting the dipole polarization angle, the dipole interaction can be adjusted from attraction to repulsion. On this basis, we study the generation and manipulation of the bright solitons using both the analytical variational method and numerical imaginary time evolution. The stability of the bright solitons is also analyzed and we map out the stability phase diagram. By adjusting the long-range dipole-dipole interaction, one can achieve manipulation of bright solitons in all aspects, including the existence, width, nodes, and stability. Considering the complexity of our system, our results will have enormous potential applications in quantum simulation of complex systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.08162v1-abstract-full').style.display = 'none'; document.getElementById('2311.08162v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.10365">arXiv:2310.10365</a> <span> [<a href="https://arxiv.org/pdf/2310.10365">pdf</a>, <a href="https://arxiv.org/format/2310.10365">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.131.133601">10.1103/PhysRevLett.131.133601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Berry Curvature and Bulk-Boundary Correspondence from Transport Measurement for Photonic Chern Bands </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+C">Chao Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+R">Run-Ze Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+J">Jizhou Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Z">Zu-En Su</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+L">Lin Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+W">Wei-Wei Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+X">Xi-Lin Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+L">Li Li</a>, <a href="/search/cond-mat?searchtype=author&query=Sanders%2C+B+C">Barry C. Sanders</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+X">Xiong-Jun Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.10365v1-abstract-short" style="display: inline;"> Berry curvature is a fundamental element to characterize topological quantum physics, while a full measurement of Berry curvature in momentum space was not reported for topological states. Here we achieve two-dimensional Berry curvature reconstruction in a photonic quantum anomalous Hall system via Hall transport measurement of a momentum-resolved wave packet. Integrating measured Berry curvature… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.10365v1-abstract-full').style.display = 'inline'; document.getElementById('2310.10365v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.10365v1-abstract-full" style="display: none;"> Berry curvature is a fundamental element to characterize topological quantum physics, while a full measurement of Berry curvature in momentum space was not reported for topological states. Here we achieve two-dimensional Berry curvature reconstruction in a photonic quantum anomalous Hall system via Hall transport measurement of a momentum-resolved wave packet. Integrating measured Berry curvature over the two-dimensional Brillouin zone, we obtain Chern numbers corresponding to -1 and 0. Further, we identify bulk-boundary correspondence by measuring topology-linked chiral edge states at the boundary. The full topological characterization of photonic Chern bands from Berry curvature, Chern number, and edge transport measurements enables our photonic system to serve as a versatile platform for further in-depth study of novel topological physics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.10365v1-abstract-full').style.display = 'none'; document.getElementById('2310.10365v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 131, 133601 (25 September 2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.16502">arXiv:2309.16502</a> <span> [<a href="https://arxiv.org/pdf/2309.16502">pdf</a>, <a href="https://arxiv.org/ps/2309.16502">ps</a>, <a href="https://arxiv.org/format/2309.16502">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.108.184431">10.1103/PhysRevB.108.184431 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> FeGe1-xSbx:a series of novel kagome metals with noncollinear antiferromagnetism </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Huang%2C+J">Jiale Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Shang%2C+C">Chenglin Shang</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jianfei Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+F">Feihao Pan</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+B">Bingxian Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+J">Jinchen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+J">Juanjuan Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+D">Daye Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+H">Hongxia Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hongliang Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Hao%2C+L">Lijie Hao</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+P">Peng Cheng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.16502v3-abstract-short" style="display: inline;"> Kagome metals are important for exploring emergent phenomena due to the interplay between band topology and electron correlation.Motivated by the recent discovery of charge density wave in a kagome lattice antiferromagnetic FeGe,we investigate the impact of Sb doping on the structural,charge and magnetic order of FeGe.The charge density wave is rapidly suppressed by Sb doping(~1.5%) and the antife… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.16502v3-abstract-full').style.display = 'inline'; document.getElementById('2309.16502v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.16502v3-abstract-full" style="display: none;"> Kagome metals are important for exploring emergent phenomena due to the interplay between band topology and electron correlation.Motivated by the recent discovery of charge density wave in a kagome lattice antiferromagnetic FeGe,we investigate the impact of Sb doping on the structural,charge and magnetic order of FeGe.The charge density wave is rapidly suppressed by Sb doping(~1.5%) and the antiferromagnetic ordering temperature gradually shifts to 280K for FeGe0.7Sb0.3.For FeGe1-xSbx with x>0.1,crystal structures with slightly distorted Fe kagome lattice are formed.Their magnetic anisotropy has significant change,temperature driven spin-reorientation and field-induced spin-flop transition are identified from magnetization measurement.Interestingly,neutron diffraction reveals noncollinear antiferromagnetic structures widely exist below TN for all sample with x>0.1.This noncollinear magnetic orders could possibly be unconventional and resulted from onsite repulsion and filling condition of kagome flat band,as predicted by a recent theoretical work. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.16502v3-abstract-full').style.display = 'none'; document.getElementById('2309.16502v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 108, 184431 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.16276">arXiv:2309.16276</a> <span> [<a href="https://arxiv.org/pdf/2309.16276">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Hidden phase uncovered by ultrafast carrier dynamics in thin Bi2O2Se </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Hao Li</a>, <a href="/search/cond-mat?searchtype=author&query=Nairan%2C+A">Adeela Nairan</a>, <a href="/search/cond-mat?searchtype=author&query=Niu%2C+X">Xiaoran Niu</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Y">Yuxiang Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+H">Huarui Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Lai%2C+L">Linqing Lai</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jingkai Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Dang%2C+L">Leyang Dang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+G">Guigen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Khan%2C+U">Usman Khan</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+F">Feng He</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.16276v2-abstract-short" style="display: inline;"> Bi2O2Se has attracted intensive attention due to its potential in electronics, optoelectronics, as well as ferroelectric applications. Despite that, there have only been a handful of experimental studies based on ultrafast spectroscopy to elucidate the carrier dynamics in Bi2O2Se thin films, Different groups have reported various ultrafast timescales and associated mechanisms across films of diffe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.16276v2-abstract-full').style.display = 'inline'; document.getElementById('2309.16276v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.16276v2-abstract-full" style="display: none;"> Bi2O2Se has attracted intensive attention due to its potential in electronics, optoelectronics, as well as ferroelectric applications. Despite that, there have only been a handful of experimental studies based on ultrafast spectroscopy to elucidate the carrier dynamics in Bi2O2Se thin films, Different groups have reported various ultrafast timescales and associated mechanisms across films of different thicknesses. A comprehensive understanding in relation to thickness and fluence is still lacking. In this work, we have systematically explored the thickness-dependent Raman spectroscopy and ultrafast carrier dynamics in chemical vapor deposition (CVD)-grown Bi2O2Se thin films on mica substrate with thicknesses varying from 22.44 nm down to 4.62 nm at both low and high pump fluence regions. Combining the thickness dependence and fluence dependence of the slow decay time, we demonstrate a ferroelectric transition in the thinner (< 8 nm) Bi2O2Se films, influenced by substrate-induced compressive strain and non-equilibrium states. Moreover, this transition can be manifested under highly non-equilibrium states. Our results deepen the understanding of the interplay between the ferroelectric phase and semiconducting characteristics of Bi2O2Se thin films, providing a new route to manipulate the ferroelectric transition. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.16276v2-abstract-full').style.display = 'none'; document.getElementById('2309.16276v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.05151">arXiv:2305.05151</a> <span> [<a href="https://arxiv.org/pdf/2305.05151">pdf</a>, <a href="https://arxiv.org/format/2305.05151">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.jcis.2023.09.092">10.1016/j.jcis.2023.09.092 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Interfacial Stresses on Droplet Interface Bilayers Using Two Photon Fluorescence Lifetime Imaging Microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Yaoqi Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Suja%2C+V+C">Vineeth Chandran Suja</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+M">Menghao Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Malkovskiy%2C+A+V">Andrey V. Malkovskiy</a>, <a href="/search/cond-mat?searchtype=author&query=Tandon%2C+A">Arnuv Tandon</a>, <a href="/search/cond-mat?searchtype=author&query=Colom%2C+A">Adai Colom</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Fuller%2C+G+G">Gerald G. Fuller</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.05151v2-abstract-short" style="display: inline;"> Response of lipid bilayers to external mechanical stimuli is an active area of research with implications for fundamental and synthetic cell biology. However, there is a lack of tools for systematically imposing mechanical strains and non-invasively mapping out interfacial (membrane) stress distributions on lipid bilayers. In this article, we report a miniature platform to manipulate model cell me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.05151v2-abstract-full').style.display = 'inline'; document.getElementById('2305.05151v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.05151v2-abstract-full" style="display: none;"> Response of lipid bilayers to external mechanical stimuli is an active area of research with implications for fundamental and synthetic cell biology. However, there is a lack of tools for systematically imposing mechanical strains and non-invasively mapping out interfacial (membrane) stress distributions on lipid bilayers. In this article, we report a miniature platform to manipulate model cell membranes in the form of droplet interface bilayers (DIBs), and non-invasively measure spatio-temporally resolved interfacial stresses using two photon fluorescence lifetime imaging of an interfacially active molecular flipper (Flipper-TR). We established the effectiveness of the developed framework by investigating interfacial stresses accompanying three key processes associated with DIBs: thin film drainage between lipid monolayer coated droplets, bilayer formation, and bilayer separation. Interestingly, the measurements also revealed fundamental aspects of DIBs including the existence of a radially decaying interfacial stress distribution post bilayer formation, and the simultaneous build up and decay of stress respectively at the bilayer corner and center during bilayer separation. Finally, utilizing interfacial rheology measurements and MD simulations, we also reveal that the tested molecular flipper is sensitive to membrane fluidity that changes with interfacial stress - expanding the scientific understanding of how molecular motors sense stress. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.05151v2-abstract-full').style.display = 'none'; document.getElementById('2305.05151v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.13400">arXiv:2304.13400</a> <span> [<a href="https://arxiv.org/pdf/2304.13400">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acs.nanolett.3c03085">10.1021/acs.nanolett.3c03085 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of Fluctuation Spin Hall Effect in Antiferromagnet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fang%2C+C">Chi Fang</a>, <a href="/search/cond-mat?searchtype=author&query=Wan%2C+C">Caihua Wan</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+X">Xiaoyue Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Okamoto%2C+S">Satoshi Okamoto</a>, <a href="/search/cond-mat?searchtype=author&query=Ma%2C+T">Tianyi Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jianying Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+X">Xiao Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Guo%2C+C">Chenyang Guo</a>, <a href="/search/cond-mat?searchtype=author&query=Dong%2C+J">Jing Dong</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guoqiang Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Wen%2C+Z">Zhenchao Wen</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+N">Ning Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Parkin%2C+S+S+P">Stuart S. P. Parkin</a>, <a href="/search/cond-mat?searchtype=author&query=Nagaosa%2C+N">Naoto Nagaosa</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+Y">Yuan Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Han%2C+X">Xiufeng Han</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.13400v1-abstract-short" style="display: inline;"> The spin Hall effect (SHE) can generate a pure spin current by an electric current, which is promisingly used to electrically control magnetization. To reduce power consumption of this control, a giant spin Hall angle (SHA) in the SHE is desired in low-resistivity systems for practical applications. Here, critical spin fluctuation near the antiferromagnetic (AFM) phase-transition is proved as an e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.13400v1-abstract-full').style.display = 'inline'; document.getElementById('2304.13400v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.13400v1-abstract-full" style="display: none;"> The spin Hall effect (SHE) can generate a pure spin current by an electric current, which is promisingly used to electrically control magnetization. To reduce power consumption of this control, a giant spin Hall angle (SHA) in the SHE is desired in low-resistivity systems for practical applications. Here, critical spin fluctuation near the antiferromagnetic (AFM) phase-transition is proved as an effective mechanism to create an additional part of SHE, named as fluctuation spin Hall effect (FSHE). This FSHE enhances the SHA due to the AFM spin fluctuation between conduction electrons and local spins. We detect the FSHE with the inverse and direct spin Hall effect (ISHE and DSHE) set-up and their temperature (T) dependences in the Cr/MgO/Fe magnetic tunnel junctions (MTJs). The SHA is significantly enhanced when temperature is approached to the N茅el temperature (T_N) and has a peak value of -0.34 at 200 K near T_N. This value is higher than the room-temperature value by 240% and comparable to that of heavy metals Ta and W. Furthermore, the spin Hall resistivity of Cr well fits the modeled T-dependence when T approaches T_N from low temperatures, implying the AFM spin fluctuation nature of strong SHA enhancement. Thus, this study demonstrates the critical spin fluctuation as a prospective way of increasing SHA and enriches the AFM material candidates for spin-orbitronic devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.13400v1-abstract-full').style.display = 'none'; document.getElementById('2304.13400v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">27 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.12697">arXiv:2210.12697</a> <span> [<a href="https://arxiv.org/pdf/2210.12697">pdf</a>, <a href="https://arxiv.org/ps/2210.12697">ps</a>, <a href="https://arxiv.org/format/2210.12697">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/acc608">10.1088/1367-2630/acc608 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tetragonal Mexican-Hat Dispersion and Switchable Half-Metal State with Multiple Anisotropic Weyl Fermions in Penta-Graphene </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jia%2C+N">Ningning Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Yongting Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Lv%2C+Z">Zhiheng Lv</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Junting Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Cai%2C+J">Jiangtao Cai</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+X">Xue Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+J">Jijun Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Z">Zhifeng Liu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.12697v1-abstract-short" style="display: inline;"> In past decades, the ever-expanding library of 2D carbon allotropes has yielded a broad range of exotic properties for the future carbon-based electronics. However, the known allotropes are all intrinsic nonmagnetic due to the paired valence electrons configuration. Based on the reported 2D carbon structure database and first-principles calculations, herein we demonstrate that inherent ferromagnet… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.12697v1-abstract-full').style.display = 'inline'; document.getElementById('2210.12697v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.12697v1-abstract-full" style="display: none;"> In past decades, the ever-expanding library of 2D carbon allotropes has yielded a broad range of exotic properties for the future carbon-based electronics. However, the known allotropes are all intrinsic nonmagnetic due to the paired valence electrons configuration. Based on the reported 2D carbon structure database and first-principles calculations, herein we demonstrate that inherent ferromagnetism can be obtained in the prominent allotrope, penta-graphene, which has an unique Mexican-hat valence band edge, giving rise to van Hove singularities and electronic instability. Induced by modest hole-doping, being achievable in electrolyte gate, the semiconducting pentagraphene can transform into different ferromagnetic half-metals with room temperature stability and switchable spin directions. In particular, multiple anisotropic Weyl states, including type-I and type-II Weyl cones and hybrid quasi Weyl nodal loop, can be found in a sizable energy window of spin-down half-metal under proper strains. These findings not only identify a promising carbon allotrope to obtain the inherent magnetism for carbon-based spintronic devices, but highlight the possibility to realize different Weyl states by combining the electronic and mechanical means as well. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.12697v1-abstract-full').style.display = 'none'; document.getElementById('2210.12697v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.11467">arXiv:2209.11467</a> <span> [<a href="https://arxiv.org/pdf/2209.11467">pdf</a>, <a href="https://arxiv.org/format/2209.11467">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Microphase separation in neutral homopolymer blends induced by salt-doping </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kong%2C+X">Xian Kong</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.11467v1-abstract-short" style="display: inline;"> Microphase separation in polymeric systems provides a bottom-up strategy to fabricate nanostructures. Polymers that are reported to undergo microphase separation usually include block copolymers or polyelectrolytes. Neutral homopolymers, which are comparatively easy to synthesize, are thought to be incapable of microphase separation. Here, using a minimal model that accounts for ion solvation, we… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.11467v1-abstract-full').style.display = 'inline'; document.getElementById('2209.11467v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.11467v1-abstract-full" style="display: none;"> Microphase separation in polymeric systems provides a bottom-up strategy to fabricate nanostructures. Polymers that are reported to undergo microphase separation usually include block copolymers or polyelectrolytes. Neutral homopolymers, which are comparatively easy to synthesize, are thought to be incapable of microphase separation. Here, using a minimal model that accounts for ion solvation, we show that microphase separation is possible in neutral homopolymer blends with sufficient dielectric contrast, upon a tiny amount of salt-doping. The driving force for the microphase separation is the competition between selective ion solvation, which places smaller ions in domains with higher dielectric constant, and the propensity for local charge neutrality to decrease the electrostatic energy. The compromise is an emergent length over which microphase separation occurs and ions are selectively solvated. The factors affecting such competitions are explored, including ion solvation radii, dielectric contrast, and polymer fraction, which point to directions for observing this behavior experimentally. These findings suggest a low-cost and facile alternative to produce microphase separation which may be exploited in advanced material design and preparation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.11467v1-abstract-full').style.display = 'none'; document.getElementById('2209.11467v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.04503">arXiv:2208.04503</a> <span> [<a href="https://arxiv.org/pdf/2208.04503">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0124578">10.1063/5.0124578 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Epitaxial growth of high quality $Mn_3Sn$ thin films by pulsed laser deposition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gao%2C+D">Dong Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Peng%2C+Z">Zheng Peng</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+N">Ningbin Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Xie%2C+Y">Yunfei Xie</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+Y">Yucong Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+W">Weihao Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Xia%2C+S">Shuang Xia</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+W">Wei Yan</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+L">Longjiang Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+T">Tao Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jun Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+X">Xiaoyan Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Bi%2C+L">Lei Bi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.04503v1-abstract-short" style="display: inline;"> Non-collinear antiferromagnet Weyl semimetal $Mn_3Sn$ have attracted great research interest recently. Although large anomalous Hall effect, anomalous Nernst effect and magneto-optical effect have been observed in $Mn_3Sn$, most studies are based on single crystals. So far, it is still challenging to grow high quality epitaxial $Mn_3Sn$ thin films with transport and optical properties comparable t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.04503v1-abstract-full').style.display = 'inline'; document.getElementById('2208.04503v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.04503v1-abstract-full" style="display: none;"> Non-collinear antiferromagnet Weyl semimetal $Mn_3Sn$ have attracted great research interest recently. Although large anomalous Hall effect, anomalous Nernst effect and magneto-optical effect have been observed in $Mn_3Sn$, most studies are based on single crystals. So far, it is still challenging to grow high quality epitaxial $Mn_3Sn$ thin films with transport and optical properties comparable to their single crystal counterparts. Here, we report the structure, magneto-optical and transport properties of epitaxial $Mn_3Sn$ thin films fabricated by pulsed laser deposition (PLD). Highly oriented $Mn_{3+x}Sn_{1-x}$ (0001) and (11$\bar2$0) epitaxial films are successfully growth on single crystalline $Al_2O_3$ and MgO substrates. Large anomalous Hall effect (AHE) up to $\left| 螖R_H\right|$=3.02 $渭惟\cdot cm$, and longitudinal magneto-optical Kerr effect (LMOKE) with $胃_K$ = 38.1 mdeg at 633 nm wavelength are measured at 300 K temperature, which are comparable to $Mn_3Sn$ single crystals. Our work demonstrates that high quality $Mn_3Sn$ epitaxial thin films can be fabricated by PLD, paving the way for future device applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.04503v1-abstract-full').style.display = 'none'; document.getElementById('2208.04503v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.03706">arXiv:2206.03706</a> <span> [<a href="https://arxiv.org/pdf/2206.03706">pdf</a>, <a href="https://arxiv.org/ps/2206.03706">ps</a>, <a href="https://arxiv.org/format/2206.03706">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevE.105.054214">10.1103/PhysRevE.105.054214 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Supersolid Gap Soliton in a Bose-Einstein Condensate and Optical Ring Cavity coupling system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lu Zhou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2206.03706v1-abstract-short" style="display: inline;"> The system of a transversely pumped Bose-Einstein condensate (BEC) coupled to a lossy ring cavity can favor a supersolid steady state. Here we find the existence of supersolid gap soliton in such a driven-dissipative system. By numerically solving the mean-field atom-cavity field coupling equations, gap solitons of a few different families have been identified. Their dynamical properties, includin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.03706v1-abstract-full').style.display = 'inline'; document.getElementById('2206.03706v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.03706v1-abstract-full" style="display: none;"> The system of a transversely pumped Bose-Einstein condensate (BEC) coupled to a lossy ring cavity can favor a supersolid steady state. Here we find the existence of supersolid gap soliton in such a driven-dissipative system. By numerically solving the mean-field atom-cavity field coupling equations, gap solitons of a few different families have been identified. Their dynamical properties, including stability, propagation and soliton collision, are also studied. Due to the feedback atom-intracavity field interaction, these supersolid gap solitons show numerous new features compared with the usual BEC gap solitons in static optical lattices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.03706v1-abstract-full').style.display = 'none'; document.getElementById('2206.03706v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. E 105, 054214 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.07806">arXiv:2205.07806</a> <span> [<a href="https://arxiv.org/pdf/2205.07806">pdf</a>, <a href="https://arxiv.org/ps/2205.07806">ps</a>, <a href="https://arxiv.org/format/2205.07806">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.106.125107">10.1103/PhysRevB.106.125107 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magneto-Transport Properties of Kagome Magnet TmMn$_6$Sn$_6$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+B">Bin Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Yi%2C+E">Enkui Yi</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+L">Leyi Li</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jianwei Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+B">Bing-Feng Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+B">Bing Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+M">Meng Wang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.07806v2-abstract-short" style="display: inline;"> Kagome magnet usually hosts nontrivial electronic or magnetic states drawing great interests in condensed matter physics. In this paper, we report a systematic study on transport properties of kagome magnet TmMn$_6$Sn$_6$. The prominent topological Hall effect (THE) has been observed in a wide temperature region spanning over several magnetic phases and exhibits strong temperature and field depend… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.07806v2-abstract-full').style.display = 'inline'; document.getElementById('2205.07806v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.07806v2-abstract-full" style="display: none;"> Kagome magnet usually hosts nontrivial electronic or magnetic states drawing great interests in condensed matter physics. In this paper, we report a systematic study on transport properties of kagome magnet TmMn$_6$Sn$_6$. The prominent topological Hall effect (THE) has been observed in a wide temperature region spanning over several magnetic phases and exhibits strong temperature and field dependence. This novel phenomenon due to non-zero spin chirality indicates possible appearance of nontrival magnetic states accompanying with strong fluctuations. The planar applied field drives planar Hall effect(PHE) and anistropic magnetoresisitivity(PAMR) exhibiting sharp disconnections in angular dependent planar resistivity violating the empirical law. By using an effective field, we identify a magnetic transition separating the PAMR into two groups belonging to various magnetic states. We extended the empirical formula to scale the field and temperature dependent planar magnetoresistivity and provide the understandings for planar transport behaviors with the crossover between various magnetic states. Our results shed lights on the novel transport effects in presence of multiple nontrivial magnetic states for the kagome lattice with complicated magnetic structures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.07806v2-abstract-full').style.display = 'none'; document.getElementById('2205.07806v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 106.125107 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.03528">arXiv:2205.03528</a> <span> [<a href="https://arxiv.org/pdf/2205.03528">pdf</a>, <a href="https://arxiv.org/format/2205.03528">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Titanium Nitride Film on Sapphire Substrate with Low Dielectric Loss for Superconducting Qubits </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Deng%2C+H">Hao Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+Z">Zhijun Song</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+R">Ran Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Xia%2C+T">Tian Xia</a>, <a href="/search/cond-mat?searchtype=author&query=Bao%2C+F">Feng Bao</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+X">Xun Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Ku%2C+H">Hsiang-Sheng Ku</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Z">Zhisheng Li</a>, <a href="/search/cond-mat?searchtype=author&query=Ma%2C+X">Xizheng Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jin Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+H">Hantao Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+C">Chengchun Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+T">Tenghui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+F">Feng Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+W">Wenlong Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+G">Gengyan Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+X">Xiaohang Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+J">Jingwei Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+X">Xing Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Yaoyun Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+H">Hui-Hai Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+C">Chunqing Deng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.03528v1-abstract-short" style="display: inline;"> Dielectric loss is one of the major decoherence sources of superconducting qubits. Contemporary high-coherence superconducting qubits are formed by material systems mostly consisting of superconducting films on substrate with low dielectric loss, where the loss mainly originates from the surfaces and interfaces. Among the multiple candidates for material systems, a combination of titanium nitride… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.03528v1-abstract-full').style.display = 'inline'; document.getElementById('2205.03528v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.03528v1-abstract-full" style="display: none;"> Dielectric loss is one of the major decoherence sources of superconducting qubits. Contemporary high-coherence superconducting qubits are formed by material systems mostly consisting of superconducting films on substrate with low dielectric loss, where the loss mainly originates from the surfaces and interfaces. Among the multiple candidates for material systems, a combination of titanium nitride (TiN) film and sapphire substrate has good potential because of its chemical stability against oxidization, and high quality at interfaces. In this work, we report a TiN film deposited onto sapphire substrate achieving low dielectric loss at the material interface. Through the systematic characterizations of a series of transmon qubits fabricated with identical batches of TiN base layers, but different geometries of qubit shunting capacitors with various participation ratios of the material interface, we quantitatively extract the loss tangent value at the substrate-metal interface smaller than $8.9 \times 10^{-4}$ in 1-nm disordered layer. By optimizing the interface participation ratio of the transmon qubit, we reproducibly achieve qubit lifetimes of up to 300 $渭$s and quality factors approaching 8 million. We demonstrate that TiN film on sapphire substrate is an ideal material system for high-coherence superconducting qubits. Our analyses further suggest that the interface dielectric loss around the Josephson junction part of the circuit could be the dominant limitation of lifetimes for state-of-the-art transmon qubits. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.03528v1-abstract-full').style.display = 'none'; document.getElementById('2205.03528v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2204.09103">arXiv:2204.09103</a> <span> [<a href="https://arxiv.org/pdf/2204.09103">pdf</a>, <a href="https://arxiv.org/ps/2204.09103">ps</a>, <a href="https://arxiv.org/format/2204.09103">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.105.134419">10.1103/PhysRevB.105.134419 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antiferromagnetic structure and magnetic properties of Dy2O2Te: An isostructural analog of the rare-earth superconductors R2O2Bi </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Liu%2C+J">Juanjuan Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+J">Jiale Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Sheng%2C+J">Jieming Sheng</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+J">Jinchen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+F">Feihao Pan</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+H">Hongxia Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+D">Daye Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jianfei Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Hao%2C+L">Lijie Hao</a>, <a href="/search/cond-mat?searchtype=author&query=Xia%2C+Y">Yuanhua Xia</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Hao Li</a>, <a href="/search/cond-mat?searchtype=author&query=Tong%2C+X">Xin Tong</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+L">Liusuo Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+P">Peng Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Bao%2C+W">Wei Bao</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2204.09103v1-abstract-short" style="display: inline;"> The rare-earth compounds R2O2Bi (R=Tb, Dy, Er, Lu, Y) are newly discovered superconductors in the vicinity of a rare-earth magnetic long-range order. In this work, we determine the magnetic order of the parent compound Dy2O2Te by neutron scattering as the A-type antiferromagnetic structure below the N茅el temperature TN=9.7K. The large staggered magnetic moment 9.4(1) 渭B per Dy at T=3.5K lies in th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.09103v1-abstract-full').style.display = 'inline'; document.getElementById('2204.09103v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2204.09103v1-abstract-full" style="display: none;"> The rare-earth compounds R2O2Bi (R=Tb, Dy, Er, Lu, Y) are newly discovered superconductors in the vicinity of a rare-earth magnetic long-range order. In this work, we determine the magnetic order of the parent compound Dy2O2Te by neutron scattering as the A-type antiferromagnetic structure below the N茅el temperature TN=9.7K. The large staggered magnetic moment 9.4(1) 渭B per Dy at T=3.5K lies in the basal ab plane. In a magnetic field, anomalous magnetic properties including the bifurcation between zero-field- and field-cooling magnetization, a butterfly-shaped magnetic hysteresis, and slow magnetic relaxation emerge, which are related to the field-induced metamagnetic transitions in Dy2O2Te. Our experimental findings could stimulate further research on the relation between antiferromagnetism and superconductivity in these rare-earth compounds. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.09103v1-abstract-full').style.display = 'none'; document.getElementById('2204.09103v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 105,134419(2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.07764">arXiv:2203.07764</a> <span> [<a href="https://arxiv.org/pdf/2203.07764">pdf</a>, <a href="https://arxiv.org/ps/2203.07764">ps</a>, <a href="https://arxiv.org/format/2203.07764">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/ac7606">10.1088/1367-2630/ac7606 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Imaginary spin-orbital coupling in parity-time symmetric systems with momentum-dependent gain and loss </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lu Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Dong%2C+G">Guangjiong Dong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.07764v1-abstract-short" style="display: inline;"> Spin-orbital coupling (SOC) and parity-time ($\mathcal{PT}$) symmetry both have attracted paramount research interest in condensed matter physics, cold atom physics, optics and acoustics to develop spintronics, quantum computation, precise sensors and novel functionalities. Natural SOC is an intrinsic relativistic effect. However, there is an increasing interest in synthesized SOC nowadays. Here,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.07764v1-abstract-full').style.display = 'inline'; document.getElementById('2203.07764v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.07764v1-abstract-full" style="display: none;"> Spin-orbital coupling (SOC) and parity-time ($\mathcal{PT}$) symmetry both have attracted paramount research interest in condensed matter physics, cold atom physics, optics and acoustics to develop spintronics, quantum computation, precise sensors and novel functionalities. Natural SOC is an intrinsic relativistic effect. However, there is an increasing interest in synthesized SOC nowadays. Here, we show that in a $\mathcal{PT}$-symmetric spin-1/2 system, the momentum-dependent balanced gain and loss can synthesize a new type of SOC, which we call imaginary SOC. The imaginary SOC can substantially change the energy spectrum of the system. Firstly, we show that it can generate a pure real energy spectrum with a double-valleys structure. Therefore, it has the ability to generate supersolid stripe states. Especially, the imaginary SOC stripe state can have a high contrast of one. Moreover, the imaginary SOC can also generate a spectrum with tunable complex energy band, in which the waves are either amplifying or decaying. Thus, the imaginary SOC would also find applications in the engineering of $\mathcal{PT}$-symmetry-based coherent wave amplifiers/absorbers. Potential experimental realizations of imaginary SOC are proposed in cold atomic gases and systems of coupled waveguides constituted of nonlocal gain and loss. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.07764v1-abstract-full').style.display = 'none'; document.getElementById('2203.07764v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.04488">arXiv:2203.04488</a> <span> [<a href="https://arxiv.org/pdf/2203.04488">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41563-023-01635-9">10.1038/s41563-023-01635-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nonreciprocal thermal radiation in ultrathin magnetized epsilon-near-zero semiconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Liu%2C+M">Mengqi Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Xia%2C+S">Shuang Xia</a>, <a href="/search/cond-mat?searchtype=author&query=Wan%2C+W">Wenjian Wan</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jun Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Hua Li</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+C">Changying Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Bi%2C+L">Lei Bi</a>, <a href="/search/cond-mat?searchtype=author&query=Qiu%2C+C">Cheng-Wei Qiu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.04488v1-abstract-short" style="display: inline;"> Spectral/angular emissivity $e$ and absorptivity $伪$ of an object are widely believed to be identical by Kirchhoff's law of thermal radiation in reciprocal systems, but this introduces an intrinsic and inevitable energy loss for energy conversion and harvesting devices. So far, experimental evidences of breaking this well-known balance are still absent, and previous theoretical proposals are restr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.04488v1-abstract-full').style.display = 'inline'; document.getElementById('2203.04488v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.04488v1-abstract-full" style="display: none;"> Spectral/angular emissivity $e$ and absorptivity $伪$ of an object are widely believed to be identical by Kirchhoff's law of thermal radiation in reciprocal systems, but this introduces an intrinsic and inevitable energy loss for energy conversion and harvesting devices. So far, experimental evidences of breaking this well-known balance are still absent, and previous theoretical proposals are restricted to narrow single-band nonreciprocal radiation. Here we observe for the first time, to our knowledge, the violation of Kirchhoff's law using ultrathin ($<位/40$, $位$ is the working wavelength) magnetized InAs semiconductor films at epsilon-near-zero (ENZ) frequencies. Large difference of $|伪-e|>0.6$ has been experimentally demonstrated under a moderate external magnetic field. Moreover, based on magnetized ENZ building blocks supporting asymmetrically radiative Berreman and surface ENZ modes, we show versatile shaping of nonreciprocal thermal radiation: single-band, dual-band, and broadband nonreciprocal emission spectra at different wavebands. Our findings of breaking Kirchhoff's law will advance the conventional understanding of emission and absorption processes of natural objects, and lay a solid foundation for more comprehensive studies in designing various nonreciprocal thermal emitters. The reported recipe of diversely shaping nonreciprocal emission will also breed new possibilities in renovating next-generation nonreciprocal energy devices in the areas of solar cells, thermophotovoltaic, radiative cooling, etc. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.04488v1-abstract-full').style.display = 'none'; document.getElementById('2203.04488v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.14563">arXiv:2112.14563</a> <span> [<a href="https://arxiv.org/pdf/2112.14563">pdf</a>, <a href="https://arxiv.org/format/2112.14563">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.129.046401">10.1103/PhysRevLett.129.046401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Topological spin texture of chiral edge states in photonic two-dimensional quantum walks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+C">Chao Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+J">Jizhou Wu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+L">Li Li</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+X">Xiong-Jun Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Sanders%2C+B+C">Barry C. Sanders</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.14563v2-abstract-short" style="display: inline;"> Topological insulators host topology-linked boundary states, whose spin and charge degrees of freedom could be exploited to design topological devices with enhanced functionality. We experimentally observe that dissipationless chiral edge states in a spin-orbit coupled anomalous Floquet topological phase exhibit topological spin texture on boundaries, realized via a two-dimensional quantum walk. O… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.14563v2-abstract-full').style.display = 'inline'; document.getElementById('2112.14563v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.14563v2-abstract-full" style="display: none;"> Topological insulators host topology-linked boundary states, whose spin and charge degrees of freedom could be exploited to design topological devices with enhanced functionality. We experimentally observe that dissipationless chiral edge states in a spin-orbit coupled anomalous Floquet topological phase exhibit topological spin texture on boundaries, realized via a two-dimensional quantum walk. Our experiment shows that, for a walker traveling around a closed loop along the boundary in real space, its spin evolves and winds through a great circle on the Bloch sphere, which implies that edge-spin texture has nontrivial winding. This winding is linked to the bulk Dirac Hamiltonian around the energy-gap opening point. Our experiment confirms that two-dimensional anomalous Floquet topological systems exhibit topological spin texture on the boundary, which could inspire novel topology-based spintronic phenomena and devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.14563v2-abstract-full').style.display = 'none'; document.getElementById('2112.14563v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 129, 046401 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.12556">arXiv:2112.12556</a> <span> [<a href="https://arxiv.org/pdf/2112.12556">pdf</a>, <a href="https://arxiv.org/ps/2112.12556">ps</a>, <a href="https://arxiv.org/format/2112.12556">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.104.214410">10.1103/PhysRevB.104.214410 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> DyOCl: a rare-earth based two-dimensional van der Waals material with strong magnetic anisotropy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tian%2C+C">Congkuan Tian</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+F">Feihao Pan</a>, <a href="/search/cond-mat?searchtype=author&query=Ye%2C+D">Dehua Ye</a>, <a href="/search/cond-mat?searchtype=author&query=Sheng%2C+J">Jieming Sheng</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+J">Jinchen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+J">Juanjuan Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+J">Jiale Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+H">Hongxia Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+D">Daye Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jianfei Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Hao%2C+L">Lijie Hao</a>, <a href="/search/cond-mat?searchtype=author&query=Xia%2C+Y">Yuanhua Xia</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Hao Li</a>, <a href="/search/cond-mat?searchtype=author&query=Tong%2C+X">Xin Tong</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+L">Liusuo Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+J">Jian-Hao Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+S">Shuang Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+P">Peng Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+J">Jianhui Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+Y">Youqu Zheng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.12556v1-abstract-short" style="display: inline;"> Comparing with the widely known transitional metal based van der Waals (vdW) materials, rare-earth based ones are rarely explored in the research of intrinsic two-dimensional (2D) magnetism. In this work, we report the physical properties of DyOCl, a rare-earth based vdW magnetic insulator with direct band gap of $\sim 5.72~eV$. The magnetic order of bulk DyOCl is determined by neutron scattering… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.12556v1-abstract-full').style.display = 'inline'; document.getElementById('2112.12556v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.12556v1-abstract-full" style="display: none;"> Comparing with the widely known transitional metal based van der Waals (vdW) materials, rare-earth based ones are rarely explored in the research of intrinsic two-dimensional (2D) magnetism. In this work, we report the physical properties of DyOCl, a rare-earth based vdW magnetic insulator with direct band gap of $\sim 5.72~eV$. The magnetic order of bulk DyOCl is determined by neutron scattering as the $A$-type antiferromagnetic structure below the N茅el temperature $T_N=10~$K. The large magnetic moment near 10.1 $ 渭_{B} $/Dy lies parallel to the $a$-axis with strong uniaxial magnetic anisotropy. At $2~K$, a moderate magnetic field ($\sim 2~T$) applied along the easy axis generates spin-flip transitions and polarizes DyOCl to a ferromagnetic state. Density functional theory calculations reveal an extremely large magnetic anisotropy energy ($-5850~渭eV/Dy$) for DyOCl, indicating the great potentials to realize magnetism in 2D limit. Furthermore, the mechanical exfoliation of bulk DyOCl single crystals down to seven layers is demonstrated. Our findings suggest DyOCl is a promising material playground to investigate 2D $f$-electron magnetism and spintronic applications at the nanoscale. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.12556v1-abstract-full').style.display = 'none'; document.getElementById('2112.12556v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 104.21 (2021): 214410 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.01199">arXiv:2110.01199</a> <span> [<a href="https://arxiv.org/pdf/2110.01199">pdf</a>, <a href="https://arxiv.org/ps/2110.01199">ps</a>, <a href="https://arxiv.org/format/2110.01199">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevE.104.044201">10.1103/PhysRevE.104.044201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Collision of two self-trapped atomic matter wave packets in an optical ring cavity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lu Zhou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.01199v1-abstract-short" style="display: inline;"> The interaction between atomic Bose-Einstein condensate (BEC) and light field in an optical ring cavity gives rise to many interesting phenomena such as supersolid and movable self-trapped matter wave packets. Here we examined the collision of two self-trapped atomic matter wave packets in an optical ring cavity, and abundant colliding phenomena have been found in the system. Depending on the magn… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.01199v1-abstract-full').style.display = 'inline'; document.getElementById('2110.01199v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.01199v1-abstract-full" style="display: none;"> The interaction between atomic Bose-Einstein condensate (BEC) and light field in an optical ring cavity gives rise to many interesting phenomena such as supersolid and movable self-trapped matter wave packets. Here we examined the collision of two self-trapped atomic matter wave packets in an optical ring cavity, and abundant colliding phenomena have been found in the system. Depending on the magnitude of colliding velocity, the collision dynamics exhibit very different features compared with the cavity-free case. When the initial colliding velocities of the two wave packets are small, they correlatedly oscillate around their initial equilibrium positions with a small amplitude. Increasing the collision velocity leads to severe scattering of the BEC atoms; after the collision, the two self-trapped wave packets usually break into small pieces. Interestingly, we found that such a medium velocity collision is of great phase sensitivity, which may make the system useful in precision matter wave interferometry. When the colliding velocity is further increased, in the bad cavity limit, the two wave packets collide phenomenally similar to two classical particles -- they firstly approach each other, then separate with their shape virtually maintained. However, beyond the bad cavity limit, they experience severe spatial spreading. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.01199v1-abstract-full').style.display = 'none'; document.getElementById('2110.01199v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. E 104, 044201 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.15545">arXiv:2106.15545</a> <span> [<a href="https://arxiv.org/pdf/2106.15545">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Quantum interference between independent solid-state single-photon sources separated by 300 km fiber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=You%2C+X">Xiang You</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+M">Ming-Yang Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+S">Si Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+R">Run-Ze Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+M+-">M. -C. Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Ge%2C+Z+-">Z. -X. Ge</a>, <a href="/search/cond-mat?searchtype=author&query=Chung%2C+T+-">T. -H. Chung</a>, <a href="/search/cond-mat?searchtype=author&query=Qiao%2C+Y+-">Y. -K. Qiao</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+Y+-">Y. -F. Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+H+-">H. -S. Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+M+-">M. -C. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">H. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y+-">Y. -M. He</a>, <a href="/search/cond-mat?searchtype=author&query=Xie%2C+X+-">X. -P. Xie</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">H. Li</a>, <a href="/search/cond-mat?searchtype=author&query=You%2C+L+-">L. -X. You</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+C">C. Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Yin%2C+J">J. Yin</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+T+-">T. -Y. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Benyoucef%2C+M">M. Benyoucef</a>, <a href="/search/cond-mat?searchtype=author&query=Huo%2C+Y">Yong-Heng Huo</a>, <a href="/search/cond-mat?searchtype=author&query=Hoefling%2C+S">S. Hoefling</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Q">Qiang Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a> , et al. (1 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.15545v1-abstract-short" style="display: inline;"> In the quest to realize a scalable quantum network, semiconductor quantum dots (QDs) offer distinct advantages including high single-photon efficiency and indistinguishability, high repetition rate (tens of GHz with Purcell enhancement), interconnectivity with spin qubits, and a scalable on-chip platform. However, in the past two decades, the visibility of quantum interference between independent… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.15545v1-abstract-full').style.display = 'inline'; document.getElementById('2106.15545v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.15545v1-abstract-full" style="display: none;"> In the quest to realize a scalable quantum network, semiconductor quantum dots (QDs) offer distinct advantages including high single-photon efficiency and indistinguishability, high repetition rate (tens of GHz with Purcell enhancement), interconnectivity with spin qubits, and a scalable on-chip platform. However, in the past two decades, the visibility of quantum interference between independent QDs rarely went beyond the classical limit of 50$\%$ and the distances were limited from a few meters to kilometers. Here, we report quantum interference between two single photons from independent QDs separated by 302 km optical fiber. The single photons are generated from resonantly driven single QDs deterministically coupled to microcavities. Quantum frequency conversions are used to eliminate the QD inhomogeneity and shift the emission wavelength to the telecommunication band. The observed interference visibility is 0.67$\pm$0.02 (0.93$\pm$0.04) without (with) temporal filtering. Feasible improvements can further extend the distance to 600 km. Our work represents a key step to long-distance solid-state quantum networks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.15545v1-abstract-full').style.display = 'none'; document.getElementById('2106.15545v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.04175">arXiv:2104.04175</a> <span> [<a href="https://arxiv.org/pdf/2104.04175">pdf</a>, <a href="https://arxiv.org/ps/2104.04175">ps</a>, <a href="https://arxiv.org/format/2104.04175">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Exact polarization energy for clusters of contacting dielectrics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lian%2C+H">Huada Lian</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.04175v1-abstract-short" style="display: inline;"> The induced surface charges appear to diverge when dielectric particles form close contacts. Resolving this singularity numerically is prohibitively expensive because high spatial resolution is needed. We show that the strength of this singularity is logarithmic in both inter-particle separation and dielectric permittivity. A regularization scheme is proposed to isolate this singularity, and to ca… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.04175v1-abstract-full').style.display = 'inline'; document.getElementById('2104.04175v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.04175v1-abstract-full" style="display: none;"> The induced surface charges appear to diverge when dielectric particles form close contacts. Resolving this singularity numerically is prohibitively expensive because high spatial resolution is needed. We show that the strength of this singularity is logarithmic in both inter-particle separation and dielectric permittivity. A regularization scheme is proposed to isolate this singularity, and to calculate the exact cohesive energy for clusters of contacting dielectric particles. The results indicate that polarization energy stabilizes clusters of open configurations when permittivity is high, in agreement with the behavior of conducting particles, but stabilizes the compact configurations when permittivity is low. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.04175v1-abstract-full').style.display = 'none'; document.getElementById('2104.04175v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">MS: 8 pages, 5 figures. SI: 7 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.04888">arXiv:2012.04888</a> <span> [<a href="https://arxiv.org/pdf/2012.04888">pdf</a>, <a href="https://arxiv.org/ps/2012.04888">ps</a>, <a href="https://arxiv.org/format/2012.04888">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.102.063309">10.1103/PhysRevA.102.063309 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Self-trapped atomic matter wave in a ring cavity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lu Zhou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2012.04888v1-abstract-short" style="display: inline;"> We studied a system of atomic Bose-Einstein condensate coupled to a ring cavity within the mean-field theory. Due to the interaction between atoms and light field, the atoms can be self-trapped. This is verified with both variational and numerical methods. We examined the stability of these self-trapped states. For a weakly pumped cavity, they spread during the evolution; while at strong pumping,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.04888v1-abstract-full').style.display = 'inline'; document.getElementById('2012.04888v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.04888v1-abstract-full" style="display: none;"> We studied a system of atomic Bose-Einstein condensate coupled to a ring cavity within the mean-field theory. Due to the interaction between atoms and light field, the atoms can be self-trapped. This is verified with both variational and numerical methods. We examined the stability of these self-trapped states. For a weakly pumped cavity, they spread during the evolution; while at strong pumping, they can maintain the shape for a long time. We also studied the moving dynamics of these self-trapped waves, and found out that it can be strongly affected by the cavity decay rate. For a small cavity decay rate, the self-trapped waves undergo a damped oscillation. Increasing the cavity decay rate will lead to a deceleration of the self-trapped waves. We also compared the main results with the semiclassical theory in which atoms are treated as classical particles. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.04888v1-abstract-full').style.display = 'none'; document.getElementById('2012.04888v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review A 102, 063309 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.01625">arXiv:2012.01625</a> <span> [<a href="https://arxiv.org/pdf/2012.01625">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/science.abe8770">10.1126/science.abe8770 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum computational advantage using photons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+H">Han-Sen Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Yu-Hao Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+M">Ming-Cheng Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Peng%2C+L">Li-Chao Peng</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+Y">Yi-Han Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+D">Dian Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+Y">Yi Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+P">Peng Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+X">Xiao-Yan Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+W">Wei-Jun Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Hao Li</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yuxuan Li</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+X">Xiao Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Gan%2C+L">Lin Gan</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+G">Guangwen Yang</a>, <a href="/search/cond-mat?searchtype=author&query=You%2C+L">Lixing You</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Zhen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+L">Li Li</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+N">Nai-Le Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2012.01625v1-abstract-short" style="display: inline;"> Gaussian boson sampling exploits squeezed states to provide a highly efficient way to demonstrate quantum computational advantage. We perform experiments with 50 input single-mode squeezed states with high indistinguishability and squeezing parameters, which are fed into a 100-mode ultralow-loss interferometer with full connectivity and random transformation, and sampled using 100 high-efficiency… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.01625v1-abstract-full').style.display = 'inline'; document.getElementById('2012.01625v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.01625v1-abstract-full" style="display: none;"> Gaussian boson sampling exploits squeezed states to provide a highly efficient way to demonstrate quantum computational advantage. We perform experiments with 50 input single-mode squeezed states with high indistinguishability and squeezing parameters, which are fed into a 100-mode ultralow-loss interferometer with full connectivity and random transformation, and sampled using 100 high-efficiency single-photon detectors. The whole optical set-up is phase-locked to maintain a high coherence between the superposition of all photon number states. We observe up to 76 output photon-clicks, which yield an output state space dimension of $10^{30}$ and a sampling rate that is $10^{14}$ faster than using the state-of-the-art simulation strategy and supercomputers. The obtained samples are validated against various hypotheses including using thermal states, distinguishable photons, and uniform distribution. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.01625v1-abstract-full').style.display = 'none'; document.getElementById('2012.01625v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 5 figures, supplemental information not included but a link is provided. This work is dedicated to the people in the fight against the COVID-19 outbreak during which the final stage of this experiment was carried out</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 370, 1460 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.11472">arXiv:2009.11472</a> <span> [<a href="https://arxiv.org/pdf/2009.11472">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.046801">10.1103/PhysRevLett.125.046801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Strain Tunable Semimetal-Topological-Insulator Transition in Monolayer 1T'-WTe2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+C">Chenxiao Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+M">Mengli Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jin Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Xia%2C+B">Bing Xia</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+C">Canhua Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+S">Shiyong Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Guan%2C+D">Dandan Guan</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yaoyi Li</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+H">Hao Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+J">Junwei Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+J">Jinfeng Jia</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.11472v1-abstract-short" style="display: inline;"> A quantum spin hall insulator(QSHI) is manifested by its conducting edge channels that originate from the nontrivial topology of the insulating bulk states. Monolayer 1T'-WTe2 exhibits this quantized edge conductance in transport measurements, but because of its semimetallic nature, the coherence length is restricted to around 100 nm. To overcome this restriction, we propose a strain engineering t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.11472v1-abstract-full').style.display = 'inline'; document.getElementById('2009.11472v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.11472v1-abstract-full" style="display: none;"> A quantum spin hall insulator(QSHI) is manifested by its conducting edge channels that originate from the nontrivial topology of the insulating bulk states. Monolayer 1T'-WTe2 exhibits this quantized edge conductance in transport measurements, but because of its semimetallic nature, the coherence length is restricted to around 100 nm. To overcome this restriction, we propose a strain engineering technique to tune the electronic structure, where either a compressive strain along a axis or a tensile strain along b axis can drive 1T'-WTe2 into an full gap insulating phase. A combined study of molecular beam epitaxy and in-situ scanning tunneling microscopy/spectroscopy then confirmed such a phase transition. Meanwhile, the topological edge states were found to be very robust in the presence of strain. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.11472v1-abstract-full').style.display = 'none'; document.getElementById('2009.11472v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 5 figure and 21 pages of supplementary material</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 046801 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.06164">arXiv:2009.06164</a> <span> [<a href="https://arxiv.org/pdf/2009.06164">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.153601">10.1103/PhysRevLett.125.153601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of intensity squeezing in resonance fluorescence from a solid-state device </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+S">Si Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+M">Ming-Cheng Chen</a>, <a href="/search/cond-mat?searchtype=author&query=You%2C+X">Xiang You</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Huo%2C+Y+-">Y. -H. Huo</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+Y">Ying Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+C">C. Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Hoefling%2C+S">Sven Hoefling</a>, <a href="/search/cond-mat?searchtype=author&query=Scully%2C+M">Marlan Scully</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.06164v1-abstract-short" style="display: inline;"> Intensity squeezing, i.e., photon number fluctuations below the shot noise limit, is a fundamental aspect of quantum optics and has wide applications in quantum metrology. It was predicted in 1979 that the intensity squeezing could be observed in resonance fluorescence from a two-level quantum system. Yet, its experimental observation in solid states was hindered by inefficiencies in generating, c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.06164v1-abstract-full').style.display = 'inline'; document.getElementById('2009.06164v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.06164v1-abstract-full" style="display: none;"> Intensity squeezing, i.e., photon number fluctuations below the shot noise limit, is a fundamental aspect of quantum optics and has wide applications in quantum metrology. It was predicted in 1979 that the intensity squeezing could be observed in resonance fluorescence from a two-level quantum system. Yet, its experimental observation in solid states was hindered by inefficiencies in generating, collecting and detecting resonance fluorescence. Here, we report the intensity squeezing in a single-mode fibre-coupled resonance fluorescence single-photon source based on a quantum dot-micropillar system. We detect pulsed single-photon streams with 22.6% system efficiency, which show subshot-noise intensity fluctuation with an intensity squeezing of 0.59 dB. We estimate a corrected squeezing of 3.29 dB at the first lens. The observed intensity squeezing provides the last piece of the fundamental picture of resonance fluorescence; which can be used as a new standard for optical radiation and in scalable quantum metrology with indistinguishable single photons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.06164v1-abstract-full').style.display = 'none'; document.getElementById('2009.06164v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 2 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.03147">arXiv:2007.03147</a> <span> [<a href="https://arxiv.org/pdf/2007.03147">pdf</a>, <a href="https://arxiv.org/ps/2007.03147">ps</a>, <a href="https://arxiv.org/format/2007.03147">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.102.013304">10.1103/PhysRevA.102.013304 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unidirectional spin transport of a spin-orbit-coupled atomic matter wave using a moving Dirac $未$-potential well </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lu Zhou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.03147v1-abstract-short" style="display: inline;"> We study the transport of a spin-orbit-coupled atomic matter wave using a moving Dirac $未$-potential well. In a spin-orbit-coupled system, bound states can be formed in both ground and excited energy levels with a Dirac $未$ potential. Because Galilean invariance is broken in a spin-orbit-coupled system, moving of the potential will induce a velocity-dependent effective detuning. This induced detun… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.03147v1-abstract-full').style.display = 'inline'; document.getElementById('2007.03147v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.03147v1-abstract-full" style="display: none;"> We study the transport of a spin-orbit-coupled atomic matter wave using a moving Dirac $未$-potential well. In a spin-orbit-coupled system, bound states can be formed in both ground and excited energy levels with a Dirac $未$ potential. Because Galilean invariance is broken in a spin-orbit-coupled system, moving of the potential will induce a velocity-dependent effective detuning. This induced detuning breaks the spin symmetry and makes the ground-state transporting channel be spin-$\uparrow$ ($\downarrow$) favored while makes the excited-state transporting channel be spin-$\downarrow$ ($\uparrow$) favored for a positive-direction (negative-direction) transporting. When the $未$-potential well moves at a small velocity, both the ground-state and the excited-state channels contribute to the transportation, and thus both the spin components can be efficiently transported. However, when the moving velocity of the $未$-potential well exceeds a critical value, the induced detuning is large enough to eliminate the excited bound state, and makes the ground bound state the only transporting channel, in which only the spin-$\uparrow$ ($\downarrow$) component can be efficiently transported in a positive (negative) direction. This work demonstrates a prototype of unidirectional spin transport. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.03147v1-abstract-full').style.display = 'none'; document.getElementById('2007.03147v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 102, 013304 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.09834">arXiv:2006.09834</a> <span> [<a href="https://arxiv.org/pdf/2006.09834">pdf</a>, <a href="https://arxiv.org/format/2006.09834">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Combining quantum spin hall effect and superconductivity in few-layer stanene </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+C">Chenxiao Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jin Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Xia%2C+B">Bing Xia</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+B">Bo Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+H">Hao Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+S">Shiyong Wang</a>, <a href="/search/cond-mat?searchtype=author&query=liu%2C+C">Canhua liu</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yaoyi Li</a>, <a href="/search/cond-mat?searchtype=author&query=Guan%2C+D">Dandan Guan</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+J">Jinfeng Jia</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.09834v1-abstract-short" style="display: inline;"> Stanene was proposed to be a quantum spin hall insulator containing topological edges states and a time reversal invariant topological superconductor hosting helical Majorana edge mode. Recently, experimental evidences of existence of topological edge states have been found in monolayer stanene films and superconductivity has been observed in few-layer stanene films excluding single layer. An inte… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.09834v1-abstract-full').style.display = 'inline'; document.getElementById('2006.09834v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.09834v1-abstract-full" style="display: none;"> Stanene was proposed to be a quantum spin hall insulator containing topological edges states and a time reversal invariant topological superconductor hosting helical Majorana edge mode. Recently, experimental evidences of existence of topological edge states have been found in monolayer stanene films and superconductivity has been observed in few-layer stanene films excluding single layer. An integrated system with both topological edge states and superconductivity are higly pursued as a possible platform to realize topological superconductivity. Few-layer stanene show great potential to meet this requirement and is highly desired in experiment. Here we successfully grow few-layer stanene on bismuth (111) substrate. Both topological edge states and superconducting gaps are observed by in-situ scanning tunneling microscopy/spectroscopy (STM/STS). Our results take a further step towards topological superconductivity by stanene films. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.09834v1-abstract-full').style.display = 'none'; document.getElementById('2006.09834v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages,4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.14604">arXiv:2005.14604</a> <span> [<a href="https://arxiv.org/pdf/2005.14604">pdf</a>, <a href="https://arxiv.org/ps/2005.14604">ps</a>, <a href="https://arxiv.org/format/2005.14604">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6455/ab82e1">10.1088/1361-6455/ab82e1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Bound states of spin-orbit coupled cold atoms in a Dirac delta-function potential </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+R">Renfei Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lu Zhou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.14604v1-abstract-short" style="display: inline;"> Dirac delta-function potential is widely studied in quantum mechanics because it usually can be exactly solved and at the same time is useful in modeling various physical systems. Here we study a system of delta-potential trapped spinorbit coupled cold atoms. The spin-orbit coupled atomic matter wave has two kinds of evanescent modes, one of which has pure imaginary wavevector and is an ordinary e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.14604v1-abstract-full').style.display = 'inline'; document.getElementById('2005.14604v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.14604v1-abstract-full" style="display: none;"> Dirac delta-function potential is widely studied in quantum mechanics because it usually can be exactly solved and at the same time is useful in modeling various physical systems. Here we study a system of delta-potential trapped spinorbit coupled cold atoms. The spin-orbit coupled atomic matter wave has two kinds of evanescent modes, one of which has pure imaginary wavevector and is an ordinary evanescent wave; while the other with a complex number wave vector is recognized as oscillating evanescent wave. We identified the eigenenergy spectra and the existence of bound states in this system. The bound states can be constructed analytically using the two kinds of evanescent modes and we found that they exhibit typical features of stripe phase, separated phase or zero-momentum phase. In addition to that, the properties of semi-bound states are also discussed, which is a localized wave packet on a plane wave background. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.14604v1-abstract-full').style.display = 'none'; document.getElementById('2005.14604v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. B: At. Mol. Opt. Phys. 53 125301 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2001.05539">arXiv:2001.05539</a> <span> [<a href="https://arxiv.org/pdf/2001.05539">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41928-020-0365-4.">10.1038/s41928-020-0365-4. <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Raman Response and Transport Properties of One-Dimensional van der Waals Tellurium Nanowires </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jing-Kai Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Liao%2C+P">Pai-Ying Liao</a>, <a href="/search/cond-mat?searchtype=author&query=Si%2C+M">Mengwei Si</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+S">Shiyuan Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Qiu%2C+G">Gang Qiu</a>, <a href="/search/cond-mat?searchtype=author&query=Jian%2C+J">Jie Jian</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Q">Qingxiao Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+S">Si-Qi Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+S">Shouyuan Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Charnas%2C+A">Adam Charnas</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yixiu Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+M+J">Moon J. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+W">Wenzhuo Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+X">Xianfan Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hai-Yan Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+L">Li Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Yap%2C+Y+K">Yoke Khin Yap</a>, <a href="/search/cond-mat?searchtype=author&query=Ye%2C+P+D">Peide D. Ye</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2001.05539v1-abstract-short" style="display: inline;"> Tellurium can form nanowires of helical atomic chains. Given their unique one-dimensional van der Waals structure, these nanowires are expected to show remarkably different physical and electronic properties than bulk tellurium. Here we show that few-chain and single-chain van der Waals tellurium nanowires can be isolated using carbon nanotube and boron nitride nanotube encapsulation. With the app… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.05539v1-abstract-full').style.display = 'inline'; document.getElementById('2001.05539v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2001.05539v1-abstract-full" style="display: none;"> Tellurium can form nanowires of helical atomic chains. Given their unique one-dimensional van der Waals structure, these nanowires are expected to show remarkably different physical and electronic properties than bulk tellurium. Here we show that few-chain and single-chain van der Waals tellurium nanowires can be isolated using carbon nanotube and boron nitride nanotube encapsulation. With the approach, the number of atomic chains can be controlled by the inner diameter of the nanotube. The Raman response of the structures suggests that the interaction between a single-atomic tellurium chain and a carbon nanotube is weak, and that the inter-chain interaction becomes stronger as the number of chains increases. Compared with bare tellurium nanowires on SiO2, nanowires encapsulated in boron nitride nanotubes exhibit a dramatically enhanced current-carrying capacity, with a current density of 1.5*10^8 A cm-2, which exceeds that of most semiconducting nanowires. We also use our tellurium nanowires encapsulated in boron nitride nanotubes to create field-effect transistors that have a diameter of only 2 nm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.05539v1-abstract-full').style.display = 'none'; document.getElementById('2001.05539v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">45 pages, 23 figures. Nature Electronics, to be published</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.09930">arXiv:1910.09930</a> <span> [<a href="https://arxiv.org/pdf/1910.09930">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.123.250503">10.1103/PhysRevLett.123.250503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Boson sampling with 20 input photons in 60-mode interferometers at $10^{14}$ state spaces </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+M">Ming-Cheng Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+S">Si Chen</a>, <a href="/search/cond-mat?searchtype=author&query=You%2C+X">Xiang You</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu-Ming He</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+X">Xiao Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Z. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=You%2C+L">L. You</a>, <a href="/search/cond-mat?searchtype=author&query=Renema%2C+J+J">J. J. Renema</a>, <a href="/search/cond-mat?searchtype=author&query=Hoefling%2C+S">Sven Hoefling</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.09930v1-abstract-short" style="display: inline;"> Quantum computing experiments are moving into a new realm of increasing size and complexity, with the short-term goal of demonstrating an advantage over classical computers. Boson sampling is a promising platform for such a goal, however, the number of involved single photons was up to five so far, limiting these small-scale implementations to a proof-of-principle stage. Here, we develop solid-sta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.09930v1-abstract-full').style.display = 'inline'; document.getElementById('1910.09930v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.09930v1-abstract-full" style="display: none;"> Quantum computing experiments are moving into a new realm of increasing size and complexity, with the short-term goal of demonstrating an advantage over classical computers. Boson sampling is a promising platform for such a goal, however, the number of involved single photons was up to five so far, limiting these small-scale implementations to a proof-of-principle stage. Here, we develop solid-state sources of highly efficient, pure and indistinguishable single photons, and 3D integration of ultra-low-loss optical circuits. We perform an experiment with 20 single photons fed into a 60-mode interferometer, and, in its output, sample over Hilbert spaces with a size of $10^{14}$ $-$over ten orders of magnitude larger than all previous experiments. The results are validated against distinguishable samplers and uniform samplers with a confidence level of 99.9%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.09930v1-abstract-full').style.display = 'none'; document.getElementById('1910.09930v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 14 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 123, 250503 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.06285">arXiv:1908.06285</a> <span> [<a href="https://arxiv.org/pdf/1908.06285">pdf</a>, <a href="https://arxiv.org/format/1908.06285">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1402-4896/ab2b5e">10.1088/1402-4896/ab2b5e <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Non-spreading matter-wave packets in a ring </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1908.06285v1-abstract-short" style="display: inline;"> Non-spreading wave packets and matter-wave packets in ring traps both have attracted great research interests due to their miraculous physical properties and tempting applications for quite a long time. Here, we proved that there exists only one set of non-spreading matter-wave packets in a free ring, and this set of wave packets have been found analytically. These non-spreading matter-wave packet… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.06285v1-abstract-full').style.display = 'inline'; document.getElementById('1908.06285v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.06285v1-abstract-full" style="display: none;"> Non-spreading wave packets and matter-wave packets in ring traps both have attracted great research interests due to their miraculous physical properties and tempting applications for quite a long time. Here, we proved that there exists only one set of non-spreading matter-wave packets in a free ring, and this set of wave packets have been found analytically. These non-spreading matter-wave packets can be realized in a toroidal trapped Bose-Einstein condensate system with the help of Feshbach resonance to eliminate contact interaction between atoms. Since experimentally residual interaction noise will always exist, its effect on the stability of these non-spreading wave packets is also examined. Qualitatively, under weak residual interaction noise, these non-spreading wave packets can preserve their shape for quite a long time, while a stronger interaction noise will induce shape breathing of the wave packets. Shape-keeping abilities of these wave packets are further studied quantitatively. We found that this set of wave packets have the same shape-keeping ability against interaction noise. And, the shape-keeping ability is linearly related to the interaction noise strength. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.06285v1-abstract-full').style.display = 'none'; document.getElementById('1908.06285v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Scr. 94 (2019) 115402 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.06818">arXiv:1907.06818</a> <span> [<a href="https://arxiv.org/pdf/1907.06818">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41566-019-0494-3">10.1038/s41566-019-0494-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Towards optimal single-photon sources from polarized microcavities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu-Ming He</a>, <a href="/search/cond-mat?searchtype=author&query=Chung%2C+T+H">Tung Hsun Chung</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+H">Hai Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+Y">Ying Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+S">Si Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+M">Ming-Cheng Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+X">Xiaoxia Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+R">Run-Ze Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Duan%2C+Z">Zhao-Chen Duan</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Jin-Peng Li</a>, <a href="/search/cond-mat?searchtype=author&query=Gerhardt%2C+S">Stefan Gerhardt</a>, <a href="/search/cond-mat?searchtype=author&query=Winkler%2C+K">Karol Winkler</a>, <a href="/search/cond-mat?searchtype=author&query=Jurkat%2C+J">Jonathan Jurkat</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+L">Lin-Jun Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Gregersen%2C+N">Niels Gregersen</a>, <a href="/search/cond-mat?searchtype=author&query=Huo%2C+Y">Yong-Heng Huo</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+Q">Qing Dai</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+S">Siyuan Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Hoefling%2C+S">Sven Hoefling</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.06818v1-abstract-short" style="display: inline;"> An optimal single-photon source should deterministically deliver one and only one photon at a time, with no trade-off between the source's efficiency and the photon indistinguishability. However, all reported solid-state sources of indistinguishable single photons had to rely on polarization filtering which reduced the efficiency by 50%, which fundamentally limited the scaling of photonic quantum… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.06818v1-abstract-full').style.display = 'inline'; document.getElementById('1907.06818v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.06818v1-abstract-full" style="display: none;"> An optimal single-photon source should deterministically deliver one and only one photon at a time, with no trade-off between the source's efficiency and the photon indistinguishability. However, all reported solid-state sources of indistinguishable single photons had to rely on polarization filtering which reduced the efficiency by 50%, which fundamentally limited the scaling of photonic quantum technologies. Here, we overcome this final long-standing challenge by coherently driving quantum dots deterministically coupled to polarization-selective Purcell microcavities--two examples are narrowband, elliptical micropillars and broadband, elliptical Bragg gratings. A polarization-orthogonal excitation-collection scheme is designed to minimize the polarization-filtering loss under resonant excitation. We demonstrate a polarized single-photon efficiency of 0.60+/-0.02 (0.56+/-0.02), a single-photon purity of 0.975+/-0.005 (0.991+/-0.003), and an indistinguishability of 0.975+/-0.006 (0.951+/-0.005) for the micropillar (Bragg grating) device. Our work provides promising solutions for truly optimal single-photon sources combining near-unity indistinguishability and near-unity system efficiency simultaneously. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.06818v1-abstract-full').style.display = 'none'; document.getElementById('1907.06818v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">28 pages, 16 figures. partial overlap with arXiv:1809.10992 which was unpublished</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Photonics 13, 770-775 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.02868">arXiv:1905.02868</a> <span> [<a href="https://arxiv.org/pdf/1905.02868">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Solar and Stellar Astrophysics">astro-ph.SR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.123.080401">10.1103/PhysRevLett.123.080401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum interference between light sources separated by 150 million kilometers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Yu-Hao Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Duan%2C+Z+-">Z. -C. Duan</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+M+-">M. -C. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu-Ming He</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Jin-Peng Li</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yu-Huai Li</a>, <a href="/search/cond-mat?searchtype=author&query=Peng%2C+L">Li-Chao Peng</a>, <a href="/search/cond-mat?searchtype=author&query=Matekole%2C+E+S">E. S. Matekole</a>, <a href="/search/cond-mat?searchtype=author&query=Byrnes%2C+T">Tim Byrnes</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+C">C. Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Kamp%2C+M">M. Kamp</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+D">Da-Wei Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Dowling%2C+J+P">Jonathan P. Dowling</a>, <a href="/search/cond-mat?searchtype=author&query=H%C3%B6fling%2C+S">Sven H枚fling</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Scully%2C+M+O">Marlan O. Scully</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.02868v3-abstract-short" style="display: inline;"> We report an experiment to test quantum interference, entanglement and nonlocality using two dissimilar photon sources, the Sun and a semiconductor quantum dot on the Earth, which are separated by 150 million kilometers. By making the otherwise vastly distinct photons indistinguishable all degrees of freedom, we observe time-resolved two-photon quantum interference with a raw visibility of 0.796(1… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02868v3-abstract-full').style.display = 'inline'; document.getElementById('1905.02868v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.02868v3-abstract-full" style="display: none;"> We report an experiment to test quantum interference, entanglement and nonlocality using two dissimilar photon sources, the Sun and a semiconductor quantum dot on the Earth, which are separated by 150 million kilometers. By making the otherwise vastly distinct photons indistinguishable all degrees of freedom, we observe time-resolved two-photon quantum interference with a raw visibility of 0.796(17), well above the 0.5 classical limit, providing the first evidence of quantum nature of thermal light. Further, using the photons with no common history, we demonstrate post-selected two-photon entanglement with a state fidelity of 0.826(24), and a violation of Bell's inequality by 2.20(6). The experiment can be further extended to a larger scale using photons from distant stars, and open a new route to quantum optics experiments at an astronomical scale. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02868v3-abstract-full').style.display = 'none'; document.getElementById('1905.02868v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">accepted version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 123, 080401 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.00275">arXiv:1905.00275</a> <span> [<a href="https://arxiv.org/pdf/1905.00275">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-019-0585-6">10.1038/s41567-019-0585-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Coherently driving a single quantum two-level system with dichromatic laser pulses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu-Ming He</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+C">Can Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+M">Ming-Cheng Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Duan%2C+Z">Zhao-Chen Duan</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+S">Si Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J">Jin-Peng Li</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+R">Run-Ze Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+C">Christian Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Atature%2C+M">Mete Atature</a>, <a href="/search/cond-mat?searchtype=author&query=Hoefling%2C+S">Sven Hoefling</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.00275v1-abstract-short" style="display: inline;"> Efficient excitation of a single two-level system usually requires that the driving field is at the same frequency as the atomic transition. However, the scattered laser light in solid-state implementations can dominate over the single photons, imposing an outstanding challenge to perfect single-photon sources. Here, we propose a background-free method using a phase-locked dichromatic electromagne… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.00275v1-abstract-full').style.display = 'inline'; document.getElementById('1905.00275v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.00275v1-abstract-full" style="display: none;"> Efficient excitation of a single two-level system usually requires that the driving field is at the same frequency as the atomic transition. However, the scattered laser light in solid-state implementations can dominate over the single photons, imposing an outstanding challenge to perfect single-photon sources. Here, we propose a background-free method using a phase-locked dichromatic electromagnetic field with no spectral overlap with the optical transition for a coherent control of a two-level system, and we demonstrate this method experimentally with a single quantum dot embedded in a micropillar. Single photons generated by pi excitation show a purity of 0.988(1) and indistinguishability of 0.962(6). Further, the phase-coherent nature of the two-color excitation is captured by the resonance-fluorescence intensity dependence on the relative phase between the two pulses. Our two-color excitation method adds a useful toolbox to the study of atom-photon interaction, and the generation of spectrally isolated indistinguishable single photons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.00275v1-abstract-full').style.display = 'none'; document.getElementById('1905.00275v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 5 figures, accepted for publication (2019)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Physics 15, 941-946 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.00170">arXiv:1905.00170</a> <span> [<a href="https://arxiv.org/pdf/1905.00170">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.scib.2019.04.007">10.1016/j.scib.2019.04.007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental Gaussian Boson Sampling </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+H">Han-Sen Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Peng%2C+L">Li-Chao Peng</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yuan Li</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+Y">Yi Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+W">Wei Li</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+D">Dian Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+W">Weijun Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Hao Li</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+L">Lu Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Zhen Wang</a>, <a href="/search/cond-mat?searchtype=author&query=You%2C+L">Lixing You</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+X">Xiao Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+L">Li Li</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+N">Nai-Le Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Dowling%2C+J+P">Jonathan P. Dowling</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.00170v1-abstract-short" style="display: inline;"> Gaussian Boson sampling (GBS) provides a highly efficient approach to make use of squeezed states from parametric down-conversion to solve a classically hard-to-solve sampling problem. The GBS protocol not only significantly enhances the photon generation probability, compared to standard boson sampling with single photon Fock states, but also links to potential applications such as dense subgraph… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.00170v1-abstract-full').style.display = 'inline'; document.getElementById('1905.00170v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.00170v1-abstract-full" style="display: none;"> Gaussian Boson sampling (GBS) provides a highly efficient approach to make use of squeezed states from parametric down-conversion to solve a classically hard-to-solve sampling problem. The GBS protocol not only significantly enhances the photon generation probability, compared to standard boson sampling with single photon Fock states, but also links to potential applications such as dense subgraph problems and molecular vibronic spectra. Here, we report the first experimental demonstration of GBS using squeezed-state sources with simultaneously high photon indistinguishability and collection efficiency. We implement and validate 3-, 4- and 5-photon GBS with high sampling rates of 832 kHz, 163 kHz and 23 kHz, respectively, which is more than 4.4, 12.0, and 29.5 times faster than the previous experiments. Further, we observe a quantum speed-up on a NP-hard optimization problem when comparing with simulated thermal sampler and uniform sampler. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.00170v1-abstract-full').style.display = 'none'; document.getElementById('1905.00170v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 4 figures, published online on 2nd April 2019</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science Bulletin 64, 511-515 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1903.06071">arXiv:1903.06071</a> <span> [<a href="https://arxiv.org/pdf/1903.06071">pdf</a>, <a href="https://arxiv.org/format/1903.06071">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.122.113602">10.1103/PhysRevLett.122.113602 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Hui Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+H">Hai Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Chung%2C+T+-">T. -H. Chung</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+X">Xiaoxia Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+J+-">J. -P. Li</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+R+-">R. -Z. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+H+-">H. -S. Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y+-">Y. -M. He</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+X">Xing Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y+-">Y. -H. Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+C">C. Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+Q">Qing Dai</a>, <a href="/search/cond-mat?searchtype=author&query=Huo%2C+Y+-">Y. -H. Huo</a>, <a href="/search/cond-mat?searchtype=author&query=H%C3%B6fling%2C+S">Sven H枚fling</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+C">Chao-Yang Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1903.06071v1-abstract-short" style="display: inline;"> An outstanding goal in quantum optics and scalable photonic quantum technology is to develop a source that each time emits one and only one entangled photon pair with simultaneously high entanglement fidelity, extraction efficiency, and photon indistinguishability. By coherent two-photon excitation of a single InGaAs quantum dot coupled to a circular Bragg grating bullseye cavity with broadband hi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.06071v1-abstract-full').style.display = 'inline'; document.getElementById('1903.06071v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1903.06071v1-abstract-full" style="display: none;"> An outstanding goal in quantum optics and scalable photonic quantum technology is to develop a source that each time emits one and only one entangled photon pair with simultaneously high entanglement fidelity, extraction efficiency, and photon indistinguishability. By coherent two-photon excitation of a single InGaAs quantum dot coupled to a circular Bragg grating bullseye cavity with broadband high Purcell factor up to 11.3, we generate entangled photon pairs with a state fidelity of 0.90(1), pair generation rate of 0.59(1), pair extraction efficiency of 0.62(6), and photon indistinguishability of 0.90(1) simultaneously. Our work will open up many applications in high-efficiency multi-photon experiments and solid-state quantum repeaters. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.06071v1-abstract-full').style.display = 'none'; document.getElementById('1903.06071v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 7 figures, PRL to appear</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1902.03652">arXiv:1902.03652</a> <span> [<a href="https://arxiv.org/pdf/1902.03652">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acs.nanolett.8b03386">10.1021/acs.nanolett.8b03386 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence of Pure Spin-Current Generated by Spin Pumping in Interface Localized States in Hybrid Metal-Silicon-Metal Vertical Structures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Cerqueira%2C+C">C. Cerqueira</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J+Y">J. Y. Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Dang%2C+H">H. Dang</a>, <a href="/search/cond-mat?searchtype=author&query=Djeffal%2C+A">A. Djeffal</a>, <a href="/search/cond-mat?searchtype=author&query=Breton%2C+J+-+L">J. -C. Le Breton</a>, <a href="/search/cond-mat?searchtype=author&query=Hehn%2C+M">M. Hehn</a>, <a href="/search/cond-mat?searchtype=author&query=Rojas-Sanchez%2C+J+-">J. -C. Rojas-Sanchez</a>, <a href="/search/cond-mat?searchtype=author&query=Devaux%2C+X">X. Devaux</a>, <a href="/search/cond-mat?searchtype=author&query=Suire%2C+S">S. Suire</a>, <a href="/search/cond-mat?searchtype=author&query=Migot%2C+S">S. Migot</a>, <a href="/search/cond-mat?searchtype=author&query=Schieffer%2C+P">P. Schieffer</a>, <a href="/search/cond-mat?searchtype=author&query=Mussot%2C+J+-">J. -G. Mussot</a>, <a href="/search/cond-mat?searchtype=author&query=Laczkowski%2C+P">P. Laczkowski</a>, <a href="/search/cond-mat?searchtype=author&query=Anane%2C+A">A. Anane</a>, <a href="/search/cond-mat?searchtype=author&query=Petit-Watelot%2C+S">S. Petit-Watelot</a>, <a href="/search/cond-mat?searchtype=author&query=Stoffel%2C+M">M. Stoffel</a>, <a href="/search/cond-mat?searchtype=author&query=Mangin%2C+S">S. Mangin</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Z">Z. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+B+W">B. W. Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Han%2C+X+F">X. F. Han</a>, <a href="/search/cond-mat?searchtype=author&query=Jaffr%C3%A8s%2C+H">H. Jaffr猫s</a>, <a href="/search/cond-mat?searchtype=author&query=George%2C+J+-">J. -M. George</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+Y">Y. Lu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1902.03652v1-abstract-short" style="display: inline;"> Due to the difficulty to grow high quality semiconductors on ferromagnetic metals, the study of spin diffusion transport in Si was only limited to lateral geometry devices. In this work, by using ultra-high vacuum wafer-bonding technique, we have successfully fabricated metal semiconductor metal CoFeB/MgO/Si/Pt vertical structures. We hereby demonstrate pure spin-current injection and transport in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.03652v1-abstract-full').style.display = 'inline'; document.getElementById('1902.03652v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1902.03652v1-abstract-full" style="display: none;"> Due to the difficulty to grow high quality semiconductors on ferromagnetic metals, the study of spin diffusion transport in Si was only limited to lateral geometry devices. In this work, by using ultra-high vacuum wafer-bonding technique, we have successfully fabricated metal semiconductor metal CoFeB/MgO/Si/Pt vertical structures. We hereby demonstrate pure spin-current injection and transport in the perpendicular current flow geometry over a distance larger than 2渭m in n-type Si at room temperature. In those experiments, a pure propagating spin-current is generated via ferromagnetic resonance spin-pumping and converted into a measurable voltage by using the inverse spin-Hall effect occurring in the top Pt layer. A systematic study by varying both Si and MgO thicknesses reveals the important role played by the localized states at the MgO/Si interface for the spin-current generation. Proximity effects involving indirect exchange interactions between the ferromagnet and the MgO/Si interface states appears to be a prerequisite to establish the necessary out-of-equilibrium spin-population in Si under the spin-pumping action. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.03652v1-abstract-full').style.display = 'none'; document.getElementById('1902.03652v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> NanoLett. 19, 90(2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.06616">arXiv:1901.06616</a> <span> [<a href="https://arxiv.org/pdf/1901.06616">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acsnano.9b01491">10.1021/acsnano.9b01491 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Room Temperature Electrocaloric Effect in Layered Ferroelectric CuInP2S6 for Solid State Refrigeration </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Si%2C+M">Mengwei Si</a>, <a href="/search/cond-mat?searchtype=author&query=Saha%2C+A+K">Atanu K. Saha</a>, <a href="/search/cond-mat?searchtype=author&query=Liao%2C+P">Pai-Ying Liao</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+S">Shengjie Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Neumayer%2C+S+M">Sabine M. Neumayer</a>, <a href="/search/cond-mat?searchtype=author&query=Jian%2C+J">Jie Jian</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jingkai Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Balke%2C+N">Nina Balke</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Haiyan Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Maksymovych%2C+P">Petro Maksymovych</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+W">Wenzhuo Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Gupta%2C+S+K">Sumeet K. Gupta</a>, <a href="/search/cond-mat?searchtype=author&query=Ye%2C+P+D">Peide D. Ye</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.06616v2-abstract-short" style="display: inline;"> A material with reversible temperature change capability under an external electric field, known as the electrocaloric effect (ECE), has long been considered as a promising solid-state cooling solution. However, electrocaloric (EC) performance of EC materials generally is not sufficiently high for real cooling applications. As a result, exploring EC materials with high performance is of great inte… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.06616v2-abstract-full').style.display = 'inline'; document.getElementById('1901.06616v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.06616v2-abstract-full" style="display: none;"> A material with reversible temperature change capability under an external electric field, known as the electrocaloric effect (ECE), has long been considered as a promising solid-state cooling solution. However, electrocaloric (EC) performance of EC materials generally is not sufficiently high for real cooling applications. As a result, exploring EC materials with high performance is of great interest and importance. Here, we report on the ECE of ferroelectric materials with van der Waals layered structure (CuInP2S6 or CIPS in this work in particular). Over 60% polarization charge change is observed within a temperature change of only 10 K at Curie temperature. Large adiabatic temperature change (|螖T|) of 3.3 K, isothermal entropy change (|螖S|) of 5.8 J kg-1 K-1 at |螖E|=142.0 kV cm-1 at 315 K (above and near room temperature) are achieved, with a large EC strength (|螖T|/|螖E|) of 29.5 mK cm kV-1. The ECE of CIPS is also investigated theoretically by numerical simulation and a further EC performance projection is provided. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.06616v2-abstract-full').style.display = 'none'; document.getElementById('1901.06616v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">32 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> ACS Nano 2019, 13, 8, 8760-8765 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.02621">arXiv:1901.02621</a> <span> [<a href="https://arxiv.org/pdf/1901.02621">pdf</a>, <a href="https://arxiv.org/ps/1901.02621">ps</a>, <a href="https://arxiv.org/format/1901.02621">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6455/aafbd3">10.1088/1361-6455/aafbd3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effect of spin-orbit coupling on tunnelling escape of Bose-Einstein condensate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.02621v1-abstract-short" style="display: inline;"> We theoretically investigate quantum tunnelling escape of a spin-orbit (SO) coupled Bose-Einstein condensate (BEC) from a trapping well. The condensate is initially prepared in a quasi-one-dimensional harmonic trap. Depending on the system parameters, the ground state can fall in different phases --- single minimum, separated or stripe. Then, suddenly the trapping well is opened at one side. The s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.02621v1-abstract-full').style.display = 'inline'; document.getElementById('1901.02621v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.02621v1-abstract-full" style="display: none;"> We theoretically investigate quantum tunnelling escape of a spin-orbit (SO) coupled Bose-Einstein condensate (BEC) from a trapping well. The condensate is initially prepared in a quasi-one-dimensional harmonic trap. Depending on the system parameters, the ground state can fall in different phases --- single minimum, separated or stripe. Then, suddenly the trapping well is opened at one side. The subsequent dynamics of the condensate is studied by solving nonlinear Schr枚dinger equations. We found that the diverse phases will greatly change the tunneling escape behavior of SO coupled BECs. In single minimum and separated phases, the condensate escapes the trapping well continuously, while in stripe phase it escapes the well as an array of pulses. We also found that SO coupling has a suppressing effect on the tunnelling escape of atoms. Especially, for BECs without inter-atom interaction, the tunnelling escape can be almost completely eliminated when the system is tuned near the transition point between single minimum and stripe phase. Our work thus suggests that SO coupling may be a useful tool to control the tunnelling dynamic of BECs, and potentially be applied in realization of atom lasers and matter wave switches. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.02621v1-abstract-full').style.display = 'none'; document.getElementById('1901.02621v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">to be published in J. Phys. B: At. Mol. Phys</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. B: At. Mol. Opt. Phys. 52 045002 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.02325">arXiv:1901.02325</a> <span> [<a href="https://arxiv.org/pdf/1901.02325">pdf</a>, <a href="https://arxiv.org/ps/1901.02325">ps</a>, <a href="https://arxiv.org/format/1901.02325">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.99.023610">10.1103/PhysRevA.99.023610 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tail-free self-accelerating solitons and vortices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jieli Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Liang%2C+Z">Zhaoxin Liang</a>, <a href="/search/cond-mat?searchtype=author&query=Malomed%2C+B+A">Boris A. Malomed</a>, <a href="/search/cond-mat?searchtype=author&query=Dong%2C+G">Guangjiong Dong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.02325v1-abstract-short" style="display: inline;"> Self-accelerating waves in conservative systems, which usually feature slowly decaying tails, such as Airy waves, have drawn great interest in studies of quantum and classical wave dynamics. They typically appear in linear media, while nonlinearities tend to deform and eventually destroy them. We demonstrate, by means of analytical and numerical methods, the existence of robust one- and two-dimens… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.02325v1-abstract-full').style.display = 'inline'; document.getElementById('1901.02325v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.02325v1-abstract-full" style="display: none;"> Self-accelerating waves in conservative systems, which usually feature slowly decaying tails, such as Airy waves, have drawn great interest in studies of quantum and classical wave dynamics. They typically appear in linear media, while nonlinearities tend to deform and eventually destroy them. We demonstrate, by means of analytical and numerical methods, the existence of robust one- and two-dimensional (1D and 2D) self-accelerating tailless solitons and solitary vortices in a model of two-component Bose-Einstein condensates, dressed by a microwave (MW) field, whose magnetic component mediates long-range interaction between the matter-wave constituents, with the feedback of the matter waves on the MW field taken into account. In particular, self-accelerating 2D solitons may move along a curved trajectory in the coordinate plane. The system may also include the spin-orbit coupling between the components, leading to similar results for the self-acceleration. The effect persists if the contact cubic nonlinearity is included. A similar mechanism may generate 1D and 2D self-accelerating solitons in optical media with thermal nonlinearity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.02325v1-abstract-full').style.display = 'none'; document.getElementById('1901.02325v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted by Phys. Rev. A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 99, 023610 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.02933">arXiv:1812.02933</a> <span> [<a href="https://arxiv.org/pdf/1812.02933">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41928-019-0338-7">10.1038/s41928-019-0338-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Ferroelectric Semiconductor Field-Effect Transistor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Si%2C+M">Mengwei Si</a>, <a href="/search/cond-mat?searchtype=author&query=Saha%2C+A+K">Atanu K. Saha</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+S">Shengjie Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Qiu%2C+G">Gang Qiu</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jingkai Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Duan%2C+Y">Yuqin Duan</a>, <a href="/search/cond-mat?searchtype=author&query=Jian%2C+J">Jie Jian</a>, <a href="/search/cond-mat?searchtype=author&query=Niu%2C+C">Chang Niu</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Haiyan Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+W">Wenzhuo Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Gupta%2C+S+K">Sumeet K. Gupta</a>, <a href="/search/cond-mat?searchtype=author&query=Ye%2C+P+D">Peide D. Ye</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.02933v2-abstract-short" style="display: inline;"> Ferroelectric field-effect transistors employ a ferroelectric material as a gate insulator, the polarization state of which can be detected using the channel conductance of the device. As a result, the devices are of potential to use in non-volatile memory technology, but suffer from short retention times, which limits their wider application. Here we report a ferroelectric semiconductor field-eff… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.02933v2-abstract-full').style.display = 'inline'; document.getElementById('1812.02933v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.02933v2-abstract-full" style="display: none;"> Ferroelectric field-effect transistors employ a ferroelectric material as a gate insulator, the polarization state of which can be detected using the channel conductance of the device. As a result, the devices are of potential to use in non-volatile memory technology, but suffer from short retention times, which limits their wider application. Here we report a ferroelectric semiconductor field-effect transistor in which a two-dimensional ferroelectric semiconductor, indium selenide (伪-In2Se3), is used as the channel material in the device. 伪-In2Se3 was chosen due to its appropriate bandgap, room temperature ferroelectricity, ability to maintain ferroelectricity down to a few atomic layers, and potential for large-area growth. A passivation method based on the atomic-layer deposition of aluminum oxide (Al2O3) was developed to protect and enhance the performance of the transistors. With 15-nm-thick hafnium oxide (HfO2) as a scaled gate dielectric, the resulting devices offer high performance with a large memory window, a high on/off ratio of over 108, a maximum on-current of 862 渭A 渭m-1, and a low supply voltage. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.02933v2-abstract-full').style.display = 'none'; document.getElementById('1812.02933v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">44 pages, 16 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat. Electron. 2, 580-586 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.01598">arXiv:1811.01598</a> <span> [<a href="https://arxiv.org/pdf/1811.01598">pdf</a>, <a href="https://arxiv.org/format/1811.01598">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.124.063902">10.1103/PhysRevLett.124.063902 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Revealing Strong Plasmon-Exciton Coupling Between Nano-gap Resonators and Two-Dimensional Semiconductors at Ambient Conditions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jian Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Z">Zhepeng Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Y">Yu-Hui Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Y">Yanfeng Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Blaikie%2C+R">Richard Blaikie</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+B">Boyang Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Qiu%2C+M">Min Qiu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1811.01598v1-abstract-short" style="display: inline;"> Strong coupling of two-dimensional semiconductor excitons with plasmonic resonators enables control of light-matter interaction at the subwavelength scale. Here we develop strong coupling in plasmonic nano-gap resonators that allow modification of exciton number contributing to the coupling. Using this system, we not only demonstrate a large vacuum Rabi splitting up to 163 meV and splitting featur… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.01598v1-abstract-full').style.display = 'inline'; document.getElementById('1811.01598v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.01598v1-abstract-full" style="display: none;"> Strong coupling of two-dimensional semiconductor excitons with plasmonic resonators enables control of light-matter interaction at the subwavelength scale. Here we develop strong coupling in plasmonic nano-gap resonators that allow modification of exciton number contributing to the coupling. Using this system, we not only demonstrate a large vacuum Rabi splitting up to 163 meV and splitting features in photoluminescence spectra, but also reveal that the exciton number can be reduced down to single-digit level (N<10), which is an order lower than that of traditional systems, close to single-exciton based strong coupling. In addition, we prove that the strong coupling process is not affected by the large exciton coherence size that was previously believed to be detrimental to the formation of plasmon-exciton interaction. Our work provides a deeper understanding of storng coupling in two-dimensional semiconductors, paving the way for room temperature quantum optics applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.01598v1-abstract-full').style.display = 'none'; document.getElementById('1811.01598v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 124, 063902 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.02244">arXiv:1803.02244</a> <span> [<a href="https://arxiv.org/pdf/1803.02244">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> </div> </div> <p class="title is-5 mathjax"> Cage occupancies of methane hydrates: Results from synchrotron X-ray diffraction and Raman spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Junfeng Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Hartmann%2C+C+D">Christiane D. Hartmann</a>, <a href="/search/cond-mat?searchtype=author&query=Kuhs%2C+W+F">Werner F. Kuhs</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1803.02244v1-abstract-short" style="display: inline;"> An accurate knowledge of cage occupancy of methane is central for understanding the physical-chemical properties of gas hydrates, the actual inventory of natural gas in hydrate deposits and the description of gas exchange processes. Here we report the absolute cage occupancies, the cage occupancy ratios and hydration numbers of the synthetic CH4-H2O and CH4-D2O hydrates formed from the ice-gas sys… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.02244v1-abstract-full').style.display = 'inline'; document.getElementById('1803.02244v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.02244v1-abstract-full" style="display: none;"> An accurate knowledge of cage occupancy of methane is central for understanding the physical-chemical properties of gas hydrates, the actual inventory of natural gas in hydrate deposits and the description of gas exchange processes. Here we report the absolute cage occupancies, the cage occupancy ratios and hydration numbers of the synthetic CH4-H2O and CH4-D2O hydrates formed from the ice-gas system under different pressures and temperatures. The results were obtained from Rietveld refinement using high-resolution synchrotron X-ray powder diffraction patterns and from Raman spectroscopic measurements. The small-cage occupancies of methane in the deuterated hydrates are found to be slightly higher than in the hydrogenated form, likely due to their different lattice constants. The CH4 occupancy in the small cages agrees fairly well with the predictions of CSMGem at the formation pressure of 3.5 MPa, but with the increasing formation pressure the disagreement grows up to 11 percent. While some deficiency of the prediction model cannot be excluded, the observed discrepancy may well be due to experimental difficulties of reaching true equilibrium at higher pressures. The experimentally determined large-to-small cage occupancy ratios of the synthetic and natural CH4 hydrates formed from the water-gas system are consistently higher than the results of CSMGem calculations. Possible reasons for these discrepancies will be discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.02244v1-abstract-full').style.display = 'none'; document.getElementById('1803.02244v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Unpublished contribution to the 8th International Conference on Gas Hydrates (ICGH-8), Beijing, China, 28 July - 1 August 2015 (was only available to the conference participants)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.06102">arXiv:1802.06102</a> <span> [<a href="https://arxiv.org/pdf/1802.06102">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Mapping fast evolution of transient surface photovoltage dynamics using G-Mode Kelvin probe force microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Collins%2C+L">Liam Collins</a>, <a href="/search/cond-mat?searchtype=author&query=Ahmadi%2C+M">Mahshid Ahmadi</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jiajun Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Ovchinnikova%2C+O+S">Olga S. Ovchinnikova</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+B">Bin Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Jesse%2C+S">Stephen Jesse</a>, <a href="/search/cond-mat?searchtype=author&query=Kalinin%2C+S+V">Sergei V. Kalinin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.06102v1-abstract-short" style="display: inline;"> Optoelectronic phenomena in materials such as organic/inorganic hybrid perovskites depend on a complex interplay between light induced carrier generation and fast (electronic) and slower (ionic) processes, all of which are known to be strongly affected by structural inhomogeneities such as interfaces and grain boundaries. Here, we develop a time resolved Kelvin probe force microscopy (KPFM) approa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.06102v1-abstract-full').style.display = 'inline'; document.getElementById('1802.06102v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.06102v1-abstract-full" style="display: none;"> Optoelectronic phenomena in materials such as organic/inorganic hybrid perovskites depend on a complex interplay between light induced carrier generation and fast (electronic) and slower (ionic) processes, all of which are known to be strongly affected by structural inhomogeneities such as interfaces and grain boundaries. Here, we develop a time resolved Kelvin probe force microscopy (KPFM) approach, based on the G-Mode SPM platform, allowing quantification of surface photovoltage (SPV) with microsecond temporal and nanoscale spatial resolution. We demonstrate the approach on methylammonium lead bromide (MAPbBr3) thin films and further highlight the usefulness of unsupervised clustering methods to quickly discern spatial variability in the information rich SPV dataset. Using this technique, we observe concurrent spatial and ultra-fast temporal variations in the SPV generated across the thin film, indicating that structure is likely responsible for the heterogenous behavior. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.06102v1-abstract-full').style.display = 'none'; document.getElementById('1802.06102v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.00944">arXiv:1711.00944</a> <span> [<a href="https://arxiv.org/pdf/1711.00944">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acsnano.7b04786">10.1021/acsnano.7b04786 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Controlled Growth of a Large-Size 2D Selenium Nanosheet and Its Electronic and Optoelectronic Applications </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J">Jingkai Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Qiu%2C+G">Gang Qiu</a>, <a href="/search/cond-mat?searchtype=author&query=Jian%2C+J">Jie Jian</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+H">Hong Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+L">Lingming Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Charnas%2C+A">Adam Charnas</a>, <a href="/search/cond-mat?searchtype=author&query=Zemlyanov%2C+D+Y">Dmitry Y Zemlyanov</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+C">Cheng-Yan Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+X">Xianfan Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+W">Wenzhuo Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Haiyan Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Ye%2C+P+D">Peide D Ye</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.00944v1-abstract-short" style="display: inline;"> Selenium has attracted intensive attention as a promising material candidate for future optoelectronic applications. However, selenium has a strong tendency to grow into nanowire forms due to its anisotropic atomic structure, which has largely hindered the exploration of its potential applications. In this work, using a physical vapor deposition method, we have demonstrated the synthesis of large-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.00944v1-abstract-full').style.display = 'inline'; document.getElementById('1711.00944v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.00944v1-abstract-full" style="display: none;"> Selenium has attracted intensive attention as a promising material candidate for future optoelectronic applications. However, selenium has a strong tendency to grow into nanowire forms due to its anisotropic atomic structure, which has largely hindered the exploration of its potential applications. In this work, using a physical vapor deposition method, we have demonstrated the synthesis of large-size, high-quality 2D selenium nanosheets, the minimum thickness of which could be as thin as 5 nm. The Se nanosheet exhibits a strong in-plane anisotropic property, which is determined by angle-resolved Raman spectroscopy. Back-gating field-effect transistors based on a Se nanosheet exhibit p-type transport behaviors with on-state current density around 20 mA/mm at Vds = 3 V. Four-terminal field effect devices are also fabricated to evaluate the intrinsic hole mobility of the selenium nanosheet, and the value is determined to be 0.26 cm2 Vs at 300 K. The selenium nanosheet phototransistors show an excellent photoresponsivity of up to 263 A/W, with a rise time of 0.1 s and fall time of 0.12 s. These results suggest that crystal selenium as a 2D form of a 1D van der Waals solid opens up the possibility to explore device applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.00944v1-abstract-full').style.display = 'none'; document.getElementById('1711.00944v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">ACS Nano, 2017, 11 (10), pp 10222</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> ACS Nano, 2017, 11 (10), pp 10222 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1705.03149">arXiv:1705.03149</a> <span> [<a href="https://arxiv.org/pdf/1705.03149">pdf</a>, <a href="https://arxiv.org/format/1705.03149">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.96.134421">10.1103/PhysRevB.96.134421 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determination of spin relaxation times in heavy metals via 2nd harmonic spin injection magnetoresistance </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fang%2C+C">C. Fang</a>, <a href="/search/cond-mat?searchtype=author&query=Wan%2C+C+H">C. H. Wan</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+X+M">X. M. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+B+S">B. S. Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+J+Y">J. Y. Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Tao%2C+B+S">B. S. Tao</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+H">H. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+X">X. Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Jin%2C+Z+M">Z. M. Jin</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffmann%2C+A">A. Hoffmann</a>, <a href="/search/cond-mat?searchtype=author&query=Han%2C+X+F">X. F. Han</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1705.03149v1-abstract-short" style="display: inline;"> In tunnel junctions between ferromagnets and heavy elements with strong spin orbit coupling the magnetoresistance is often dominated by tunneling anisotropic magnetoresistance (TAMR). This makes conventional DC spin injection techniques impractical for determining the spin relaxation time ($蟿_s$). Here, we show that this obstacle for measurements of $蟿_s$ can be overcome by 2nd harmonic spin-injec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.03149v1-abstract-full').style.display = 'inline'; document.getElementById('1705.03149v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1705.03149v1-abstract-full" style="display: none;"> In tunnel junctions between ferromagnets and heavy elements with strong spin orbit coupling the magnetoresistance is often dominated by tunneling anisotropic magnetoresistance (TAMR). This makes conventional DC spin injection techniques impractical for determining the spin relaxation time ($蟿_s$). Here, we show that this obstacle for measurements of $蟿_s$ can be overcome by 2nd harmonic spin-injection-magnetoresistance (SIMR). In the 2nd harmonic signal the SIMR is comparable in magnitude to TAMR, thus enabling Hanle-induced SIMR as a powerful tool to directly determine $蟿_s$. Using this approach we determined the spin relaxation time of Pt and Ta and their temperature dependences. The spin relaxation in Pt seems to be governed by Elliott-Yafet mechanism due to a constant resistivity $\times$spin relaxation time product over a wide temperature range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.03149v1-abstract-full').style.display = 'none'; document.getElementById('1705.03149v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 May, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 96, 134421 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.06104">arXiv:1702.06104</a> <span> [<a href="https://arxiv.org/pdf/1702.06104">pdf</a>, <a href="https://arxiv.org/format/1702.06104">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.118.127203">10.1103/PhysRevLett.118.127203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Temperature Dependence of Magnetic Excitations: Terahertz Magnons above the Curie Temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qin%2C+H+J">H. J. Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Zakeri%2C+K">Kh. Zakeri</a>, <a href="/search/cond-mat?searchtype=author&query=Ernst%2C+A">A. Ernst</a>, <a href="/search/cond-mat?searchtype=author&query=Kirschner%2C+J">J. Kirschner</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1702.06104v1-abstract-short" style="display: inline;"> When an ordered spin system of a given dimensionality undergoes a second order phase transition the dependence of the order parameter i.e. magnetization on temperature can be well-described by thermal excitations of elementary collective spin excitations (magnons). However, the behavior of magnons themselves, as a function of temperature and across the transition temperature TC, is an unknown issu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.06104v1-abstract-full').style.display = 'inline'; document.getElementById('1702.06104v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.06104v1-abstract-full" style="display: none;"> When an ordered spin system of a given dimensionality undergoes a second order phase transition the dependence of the order parameter i.e. magnetization on temperature can be well-described by thermal excitations of elementary collective spin excitations (magnons). However, the behavior of magnons themselves, as a function of temperature and across the transition temperature TC, is an unknown issue. Utilizing spin-polarized high resolution electron energy loss spectroscopy we monitor the high-energy (terahertz) magnons, excited in an ultrathin ferromagnet, as a function of temperature. We show that the magnons' energy and lifetime decrease with temperature. The temperature-induced renormalization of the magnons' energy and lifetime depends on the wave vector. We provide quantitative results on the temperature-induced damping and discuss the possible mechanism e.g., multi-magnon scattering. A careful investigation of physical quantities determining the magnons' propagation indicates that terahertz magnons sustain their propagating character even at temperatures far above TC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.06104v1-abstract-full').style.display = 'none'; document.getElementById('1702.06104v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 Pages, 3 Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 118, 127203 (2017) </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Qin%2C+J&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Qin%2C+J&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Qin%2C+J&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Qin%2C+J&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> </ul> </nav> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> 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