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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <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/2012.05884">arXiv:2012.05884</a> <span> [<a href="https://arxiv.org/pdf/2012.05884">pdf</a>, <a href="https://arxiv.org/format/2012.05884">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/10.1063/5.0039059">10.1063/5.0039059 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Absence of a Dirac gap in ferromagnetic Cr$_x$(Bi$_{0.1}$Sb$_{0.9}$)$_{2-x}$Te$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Denlinger%2C+J+D">Jonathan D. Denlinger</a>, <a href="/search/cond-mat?searchtype=author&query=Kundu%2C+A+K">Asish K. Kundu</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G">Genda Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Valla%2C+T">Tonica Valla</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="2012.05884v1-abstract-short" style="display: inline;"> Magnetism breaks the time reversal symmetry expected to open a Dirac gap in 3D topological insulators that consequently leads to quantum anomalous Hall effect. The most common approach of inducing ferromagnetic state is by doping magnetic 3$d$ elements into bulk of 3D topological insulators. In Cr$_{0.15}$(Bi$_{0.1}$Sb$_{0.9}$)$_{1.85}$Te$_3$, the material where the quantum anomalous Hall effect w… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.05884v1-abstract-full').style.display = 'inline'; document.getElementById('2012.05884v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.05884v1-abstract-full" style="display: none;"> Magnetism breaks the time reversal symmetry expected to open a Dirac gap in 3D topological insulators that consequently leads to quantum anomalous Hall effect. The most common approach of inducing ferromagnetic state is by doping magnetic 3$d$ elements into bulk of 3D topological insulators. In Cr$_{0.15}$(Bi$_{0.1}$Sb$_{0.9}$)$_{1.85}$Te$_3$, the material where the quantum anomalous Hall effect was initially discovered at temperatures much lower than the ferromagnetic transition, $T_C$, the scanning tunneling microscopy studies have reported a large Dirac gap $\sim20-100$ meV. The discrepancy between the low temperature of quantum anomalous Hall effect ($\ll T_C$) and large spectroscopic Dirac gaps ($\gg T_C$) found in magnetic topological insulators remains puzzling. Here, we used angle-resolved photoemission spectroscopy to study the surface electronic structure of pristine and potassium doped surface of Cr$_{0.15}$(Bi$_{0.1}$Sb$_{0.9}$)$_{1.85}$Te$_3$. Upon potassium deposition, the $p$-type surface state of pristine sample was turned into an $n$-type, allowing spectroscopic observation of Dirac point. We find a gapless surface state, with no evidence of a large Dirac gap reported in tunneling studies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.05884v1-abstract-full').style.display = 'none'; document.getElementById('2012.05884v1-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 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">7 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Applied Physics 129, 083902 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.00915">arXiv:1904.00915</a> <span> [<a href="https://arxiv.org/pdf/1904.00915">pdf</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/10.1073/pnas.1821454116">10.1073/pnas.1821454116 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for a Vestigial Nematic State in the Cuprate Pseudogap Phase </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mukhopadhyay%2C+S">Sourin Mukhopadhyay</a>, <a href="/search/cond-mat?searchtype=author&query=Sharma%2C+R">Rahul Sharma</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Edkins%2C+S+D">Stephen D. Edkins</a>, <a href="/search/cond-mat?searchtype=author&query=Hamidian%2C+M+H">Mohammad H. Hamidian</a>, <a href="/search/cond-mat?searchtype=author&query=Eisaki%2C+H">Hiroshi Eisaki</a>, <a href="/search/cond-mat?searchtype=author&query=Uchida%2C+S">Shin-ichi Uchida</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E">Eun-Ah Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lawler%2C+M+J">Michael J. Lawler</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">Andrew P. Mackenzie</a>, <a href="/search/cond-mat?searchtype=author&query=Davis%2C+J+C+S">J. C. S茅amus Davis</a>, <a href="/search/cond-mat?searchtype=author&query=Fujita%2C+K">Kazuhiro Fujita</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="1904.00915v2-abstract-short" style="display: inline;"> The CuO$_2$ antiferromagnetic insulator is transformed by hole-doping into an exotic quantum fluid usually referred to as the pseudogap (PG) phase. Its defining characteristic is a strong suppression of the electronic density-of-states D(E) for energies |E|<$螖^*$, where $螖^*$ is the pseudogap energy. Unanticipated broken-symmetry phases have been detected by a wide variety of techniques in the PG… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.00915v2-abstract-full').style.display = 'inline'; document.getElementById('1904.00915v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.00915v2-abstract-full" style="display: none;"> The CuO$_2$ antiferromagnetic insulator is transformed by hole-doping into an exotic quantum fluid usually referred to as the pseudogap (PG) phase. Its defining characteristic is a strong suppression of the electronic density-of-states D(E) for energies |E|<$螖^*$, where $螖^*$ is the pseudogap energy. Unanticipated broken-symmetry phases have been detected by a wide variety of techniques in the PG regime, most significantly a finite Q density-wave (DW) state and a Q=0 nematic (NE) state. Sublattice-phase-resolved imaging of electronic structure allows the doping and energy dependence of these distinct broken symmetry states to be visualized simultaneously. Using this approach, we show that, even though their reported ordering temperatures T$_{DW}$ and T$_{NE}$ are unrelated to each other, both the DW and NE states always exhibit their maximum spectral intensity at the same energy, and using independent measurements that this is the pseudogap energy $螖^*$. Moreover, no new energy-gap opening coincides with the appearance of the DW state (which should theoretically open an energy gap on the Fermi-surface), while the observed pseudogap opening coincides with the appearance of the NE state (which should theoretically be incapable of opening a Fermi-surface gap). We demonstrate how this perplexing phenomenology of thermal transitions and energy-gap opening at the breaking of two highly distinct symmetries can be understood as the natural consequence of a vestigial nematic state , within the pseudogap phase of Bi$_2$Sr$_2$CaCu$_2$O$_8$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.00915v2-abstract-full').style.display = 'none'; document.getElementById('1904.00915v2-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 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.04811">arXiv:1805.04811</a> <span> [<a href="https://arxiv.org/pdf/1805.04811">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"> In-situ angle-resolved photoemission spectroscopy of copper-oxide thin films synthesized by molecular beam epitaxy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Drozdov%2C+I+K">Ilya K. Drozdov</a>, <a href="/search/cond-mat?searchtype=author&query=Fujita%2C+K">Kazuhiro Fujita</a>, <a href="/search/cond-mat?searchtype=author&query=Davis%2C+J+C+S">J. C. S茅amus Davis</a>, <a href="/search/cond-mat?searchtype=author&query=Bo%C5%BEovi%C4%87%2C+I">Ivan Bo啪ovi膰</a>, <a href="/search/cond-mat?searchtype=author&query=Valla%2C+T">Tonica Valla</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="1805.04811v1-abstract-short" style="display: inline;"> Angle-resolved photoemission spectroscopy (ARPES) is the key momentum-resolved technique for direct probing of the electronic structure of a material. However, since it is very surface-sensitive, it has been applied to a relatively small set of complex oxides that can be easily cleaved in ultra-high vacuum. Here we describe a new multi-module system at Brookhaven National Laboratory (BNL) in which… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.04811v1-abstract-full').style.display = 'inline'; document.getElementById('1805.04811v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.04811v1-abstract-full" style="display: none;"> Angle-resolved photoemission spectroscopy (ARPES) is the key momentum-resolved technique for direct probing of the electronic structure of a material. However, since it is very surface-sensitive, it has been applied to a relatively small set of complex oxides that can be easily cleaved in ultra-high vacuum. Here we describe a new multi-module system at Brookhaven National Laboratory (BNL) in which an oxide molecular beam epitaxy (OMBE) is interconnected with an ARPES and a spectroscopic-imaging scanning tunneling microscopy (SI-STM) module. This new capability largely expands the range of complex-oxide materials and artificial heterostructures accessible to these two most powerful and complementary techniques for studies of electronic structure of materials. We also present the first experimental results obtained using this system - the ARPES studies of electronic band structure of a La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) thin film grown by OMBE. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.04811v1-abstract-full').style.display = 'none'; document.getElementById('1805.04811v1-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> 12 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">16 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/1507.07865">arXiv:1507.07865</a> <span> [<a href="https://arxiv.org/pdf/1507.07865">pdf</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> </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/nphys3519">10.1038/nphys3519 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Atomic-scale Electronic Structure of the Cuprate d-Symmetry Form Factor Density Wave State </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hamidian%2C+M+H">M. H. Hamidian</a>, <a href="/search/cond-mat?searchtype=author&query=Edkins%2C+S+D">S. D. Edkins</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Davis%2C+J+C+S">J. C. S茅amus Davis</a>, <a href="/search/cond-mat?searchtype=author&query=Mackenzie%2C+A+P">A. P. Mackenzie</a>, <a href="/search/cond-mat?searchtype=author&query=Eisaki%2C+H">H. Eisaki</a>, <a href="/search/cond-mat?searchtype=author&query=Uchida%2C+S">S. Uchida</a>, <a href="/search/cond-mat?searchtype=author&query=Lawler%2C+M+J">M. J. Lawler</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E+-">E. -A. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Sachdev%2C+S">Subir Sachdev</a>, <a href="/search/cond-mat?searchtype=author&query=Fujita%2C+K">K. Fujita</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="1507.07865v1-abstract-short" style="display: inline;"> Extensive research into high temperature superconducting cuprates is now focused upon identifying the relationship between the classic 'pseudogap' phenomenon$^{1,2}$ and the more recently investigated density wave state$^{3-13}$. This state always exhibits wave vector $Q$ parallel to the planar Cu-O-Cu bonds$^{4-13}$ along with a predominantly $d$-symmetry form factor$^{14-17}$ (dFF-DW). Finding i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.07865v1-abstract-full').style.display = 'inline'; document.getElementById('1507.07865v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.07865v1-abstract-full" style="display: none;"> Extensive research into high temperature superconducting cuprates is now focused upon identifying the relationship between the classic 'pseudogap' phenomenon$^{1,2}$ and the more recently investigated density wave state$^{3-13}$. This state always exhibits wave vector $Q$ parallel to the planar Cu-O-Cu bonds$^{4-13}$ along with a predominantly $d$-symmetry form factor$^{14-17}$ (dFF-DW). Finding its microscopic mechanism has now become a key objective$^{18-30}$ of this field. To accomplish this, one must identify the momentum-space ($k$-space) states contributing to the dFF-DW spectral weight, determine their particle-hole phase relationship about the Fermi energy, establish whether they exhibit a characteristic energy gap, and understand the evolution of all these phenomena throughout the phase diagram. Here we use energy-resolved sublattice visualization$^{14}$ of electronic structure and show that the characteristic energy of the dFF-DW modulations is actually the 'pseudogap' energy $螖_{1}$. Moreover, we demonstrate that the dFF-DW modulations at $E=-螖_{1}$ (filled states) occur with relative phase $蟺$ compared to those at $E=螖_{1}$ (empty states). Finally, we show that the dFF-DW $Q$ corresponds directly to scattering between the 'hot frontier' regions of $k$-space beyond which Bogoliubov quasiparticles cease to exist$^{31,32,33}$. These data demonstrate that the dFF-DW state is consistent with particle-hole interactions focused at the pseudogap energy scale and between the four pairs of 'hot frontier' regions in $k$-space where the pseudogap opens. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.07865v1-abstract-full').style.display = 'none'; document.getElementById('1507.07865v1-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> 28 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Physics 12, 150 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1412.2718">arXiv:1412.2718</a> <span> [<a href="https://arxiv.org/pdf/1412.2718">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/10.1073/pnas.1424322112">10.1073/pnas.1424322112 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Imaging Dirac-Mass Disorder from Magnetic Dopant-Atoms in the Ferromagnetic Topological Insulator Cr$_x$(Bi$_{0.1}$Sb$_{0.9}$)$_{2-x}$Te$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+I">Inhee Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+J">Jinho Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Billinge%2C+S+J+L">S. J. L. Billinge</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+R+D">R. D. Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Schneeloch%2C+J+A">J. A. Schneeloch</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+T+S">T. S. Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Valla%2C+T">T. Valla</a>, <a href="/search/cond-mat?searchtype=author&query=Tranquada%2C+J+M">J. M. Tranquada</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G+D">G. D. Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Davis%2C+J+C+S">J. C. S茅amus Davis</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="1412.2718v1-abstract-short" style="display: inline;"> To achieve and utilize the most exotic electronic phenomena predicted for the surface states of 3D topological insulators (TI),it is necessary to open a "Dirac-mass gap" in their spectrum by breaking time-reversal symmetry. Use of magnetic dopant atoms to generate a ferromagnetic state is the most widely used approach. But it is unknown how the spatial arrangements of the magnetic dopant atoms inf… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.2718v1-abstract-full').style.display = 'inline'; document.getElementById('1412.2718v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1412.2718v1-abstract-full" style="display: none;"> To achieve and utilize the most exotic electronic phenomena predicted for the surface states of 3D topological insulators (TI),it is necessary to open a "Dirac-mass gap" in their spectrum by breaking time-reversal symmetry. Use of magnetic dopant atoms to generate a ferromagnetic state is the most widely used approach. But it is unknown how the spatial arrangements of the magnetic dopant atoms influence the Dirac-mass gap at the atomic scale or, conversely, whether the ferromagnetic interactions between dopant atoms are influenced by the topological surface states. Here we image the locations of the magnetic (Cr) dopant atoms in the ferromagnetic TI Cr$_{0.08}$(Bi$_{0.1}$Sb$_{0.9}$)$_{1.92}$Te$_3$. Simultaneous visualization of the Dirac-mass gap $螖(r)$ reveals its intense disorder, which we demonstrate directly is related to fluctuations in $n(r)$, the Cr atom areal density in the termination layer. We find the relationship of surface-state Fermi wavevectors to the anisotropic structure of $螖(r)$ consistent with predictions for surface ferromagnetism mediated by those states. Moreover, despite the intense Dirac-mass disorder, the anticipated relationship $螖(r)\propto n(r)$ is confirmed throughout, and exhibits an electron-dopant interaction energy $J^*$=145$meV\cdot nm^2$. These observations reveal how magnetic dopant atoms actually generate the TI mass gap locally and that, to achieve the novel physics expected of time-reversal-symmetry breaking TI materials, control of the resulting Dirac-mass gap disorder will be essential. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.2718v1-abstract-full').style.display = 'none'; document.getElementById('1412.2718v1-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 December, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PNAS 112, 1316 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.0362">arXiv:1404.0362</a> <span> [<a href="https://arxiv.org/pdf/1404.0362">pdf</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="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/10.1073/pnas.1406297111">10.1073/pnas.1406297111 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fujita%2C+K">K. Fujita</a>, <a href="/search/cond-mat?searchtype=author&query=Hamidian%2C+M+H">M. H. Hamidian</a>, <a href="/search/cond-mat?searchtype=author&query=Edkins%2C+S+D">S. D. Edkins</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kohsaka%2C+Y">Y. Kohsaka</a>, <a href="/search/cond-mat?searchtype=author&query=Azuma%2C+M">M. Azuma</a>, <a href="/search/cond-mat?searchtype=author&query=Takano%2C+M">M. Takano</a>, <a href="/search/cond-mat?searchtype=author&query=Takagi%2C+H">H. Takagi</a>, <a href="/search/cond-mat?searchtype=author&query=Eisaki%2C+H">H. Eisaki</a>, <a href="/search/cond-mat?searchtype=author&query=Uchida%2C+S">S. Uchida</a>, <a href="/search/cond-mat?searchtype=author&query=Allais%2C+A">A. Allais</a>, <a href="/search/cond-mat?searchtype=author&query=Lawler%2C+M+J">M. J. Lawler</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E+-">E. -A. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Sachdev%2C+S">Subir Sachdev</a>, <a href="/search/cond-mat?searchtype=author&query=Davis%2C+J+C+S">J. C. S茅amus Davis</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="1404.0362v2-abstract-short" style="display: inline;"> The identity of the fundamental broken symmetry (if any) in the underdoped cuprates is unresolved. However, evidence has been accumulating that this state may be an unconventional density wave. Here we carry out site-specific measurements within each CuO$_2$ unit-cell, segregating the results into three separate electronic structure images containing only the Cu sites (Cu(r)) and only the x/y-axis… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.0362v2-abstract-full').style.display = 'inline'; document.getElementById('1404.0362v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.0362v2-abstract-full" style="display: none;"> The identity of the fundamental broken symmetry (if any) in the underdoped cuprates is unresolved. However, evidence has been accumulating that this state may be an unconventional density wave. Here we carry out site-specific measurements within each CuO$_2$ unit-cell, segregating the results into three separate electronic structure images containing only the Cu sites (Cu(r)) and only the x/y-axis O sites (O$_x$(r) and O$_y$(r)). Phase resolved Fourier analysis reveals directly that the modulations in the O$_x$(r) and O$_y$(r) sublattice images consistently exhibit a relative phase of $蟺$. We confirm this discovery on two highly distinct cuprate compounds, ruling out tunnel matrix-element and materials specific systematics. These observations demonstrate by direct sublattice phase-resolved visualization that the density wave found in underdoped cuprates consists of modulations of the intra-unit-cell states that exhibit a predominantly d-symmetry form factor. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.0362v2-abstract-full').style.display = 'none'; document.getElementById('1404.0362v2-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 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proceedings of the National Academy of Sciences of the USA111, E3026-E3032 (Jul 2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1403.7788">arXiv:1403.7788</a> <span> [<a href="https://arxiv.org/pdf/1403.7788">pdf</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> </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.1248783">10.1126/science.1248783 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Simultaneous Transitions in Cuprate Momentum-Space Topology and Electronic Symmetry Breaking </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fujita%2C+K">K. Fujita</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+I">Inhee Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+J">Jinho Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Hamidian%2C+M+H">M. H. Hamidian</a>, <a href="/search/cond-mat?searchtype=author&query=Firmo%2C+I+A">I. A. Firmo</a>, <a href="/search/cond-mat?searchtype=author&query=Mukhopadhyay%2C+S">S. Mukhopadhyay</a>, <a href="/search/cond-mat?searchtype=author&query=Eisaki%2C+H">H. Eisaki</a>, <a href="/search/cond-mat?searchtype=author&query=Uchida%2C+S">S. Uchida</a>, <a href="/search/cond-mat?searchtype=author&query=Lawler%2C+M+J">M. J. Lawler</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E+-">E. -A. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Davis%2C+J+C">J. C. Davis</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="1403.7788v2-abstract-short" style="display: inline;"> The existence of electronic symmetry breaking in the underdoped cuprates, and its disappearance with increased hole-density $p$, are now widely reported. However, the relationship between this transition and the momentum space ($\vec{k}$-space) electronic structure underpinning the superconductivity has not been established. Here we visualize the $\vec{Q}$=0 (intra-unit-cell) and $\vec{Q}\neq$0 (d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.7788v2-abstract-full').style.display = 'inline'; document.getElementById('1403.7788v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1403.7788v2-abstract-full" style="display: none;"> The existence of electronic symmetry breaking in the underdoped cuprates, and its disappearance with increased hole-density $p$, are now widely reported. However, the relationship between this transition and the momentum space ($\vec{k}$-space) electronic structure underpinning the superconductivity has not been established. Here we visualize the $\vec{Q}$=0 (intra-unit-cell) and $\vec{Q}\neq$0 (density wave) broken-symmetry states simultaneously with the coherent $\vec{k}$-space topology, for Bi$_2$Sr$_2$CaCu$_2$O$_{8+d}$ samples spanning the phase diagram 0.06$\leq p \leq$0.23. We show that the electronic symmetry breaking tendencies weaken with increasing $p$ and disappear close to $p_c$=0.19. Concomitantly, the coherent $\vec{k}$-space topology undergoes an abrupt transition, from arcs to closed contours, at the same $p_c$. These data reveal that the $\vec{k}$-space topology transformation in cuprates is linked intimately with the disappearance of the electronic symmetry breaking at a concealed critical point. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.7788v2-abstract-full').style.display = 'none'; document.getElementById('1403.7788v2-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, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 March, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2014. </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">Journal reference added. Main materials: 13 pages, 4 figures. Supplementary materials: 18 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 344, 612-616 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1102.1767">arXiv:1102.1767</a> <span> [<a href="https://arxiv.org/pdf/1102.1767">pdf</a>, <a href="https://arxiv.org/format/1102.1767">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="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/10.1063/1.3676262">10.1063/1.3676262 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Acoustic metamaterial exhibiting four different sign combinations of density and modulus </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Seo%2C+Y+M">Yong Mun Seo</a>, <a href="/search/cond-mat?searchtype=author&query=Park%2C+J+J">Jong Jin Park</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+H">Seung Hwan Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Park%2C+C+M">Choon Mahn Park</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+H">Sam Hyeon Lee</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="1102.1767v1-abstract-short" style="display: inline;"> We fabricated a double negative acoustic metamaterial which consisted of Helmholtz resonators and membranes. Experimental data on the transmission and dispersion relation are presented. The system exhibits three frequencies where the acoustic state makes sharp transitions from density negative (蟻 -NG) to double negative (DNG), modulus negative (B-NG), and double positive (DPS) in sequence with the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.1767v1-abstract-full').style.display = 'inline'; document.getElementById('1102.1767v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1102.1767v1-abstract-full" style="display: none;"> We fabricated a double negative acoustic metamaterial which consisted of Helmholtz resonators and membranes. Experimental data on the transmission and dispersion relation are presented. The system exhibits three frequencies where the acoustic state makes sharp transitions from density negative (蟻 -NG) to double negative (DNG), modulus negative (B-NG), and double positive (DPS) in sequence with the frequency. We observed a wide range of negative refractive index from -0.06 to -3.7 relative to air, which will allow for new acoustic transformation techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.1767v1-abstract-full').style.display = 'none'; document.getElementById('1102.1767v1-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 February, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2011. </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, 4 figures, submitted to Physical Review Letters</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1007.3216">arXiv:1007.3216</a> <span> [<a href="https://arxiv.org/pdf/1007.3216">pdf</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="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/10.1038/nature09169">10.1038/nature09169 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lawler%2C+M+J">M. J. Lawler</a>, <a href="/search/cond-mat?searchtype=author&query=Fujita%2C+K">K. Fujita</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+J">Jhinhwan Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Schmidt%2C+A+R">A. R. Schmidt</a>, <a href="/search/cond-mat?searchtype=author&query=Kohsaka%2C+Y">Y. Kohsaka</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Eisaki%2C+H">H. Eisaki</a>, <a href="/search/cond-mat?searchtype=author&query=Uchida%2C+S">S. Uchida</a>, <a href="/search/cond-mat?searchtype=author&query=Davis%2C+J+C">J. C. Davis</a>, <a href="/search/cond-mat?searchtype=author&query=Sethna%2C+J+P">J. P. Sethna</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E">Eun-Ah Kim</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="1007.3216v1-abstract-short" style="display: inline;"> In the high-transition-temperature (high-Tc) superconductors the pseudogap phase becomes predominant when the density of doped holes is reduced1. Within this phase it has been unclear which electronic symmetries (if any) are broken, what the identity of any associated order parameter might be, and which microscopic electronic degrees of freedom are active. Here we report the determination of a qua… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1007.3216v1-abstract-full').style.display = 'inline'; document.getElementById('1007.3216v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1007.3216v1-abstract-full" style="display: none;"> In the high-transition-temperature (high-Tc) superconductors the pseudogap phase becomes predominant when the density of doped holes is reduced1. Within this phase it has been unclear which electronic symmetries (if any) are broken, what the identity of any associated order parameter might be, and which microscopic electronic degrees of freedom are active. Here we report the determination of a quantitative order parameter representing intra-unit-cell nematicity: the breaking of rotational symmetry by the electronic structure within CuO2 unit cell. We analyze spectroscopic-imaging scanning tunneling microscope images of the intra-unit-cell states in underdoped Bi2Sr2CaCu2O8+未 and, using two independent evaluation techniques, find evidence for electronic nematicity of the states close to the pseudogap energy. Moreover, we demonstrate directly that these phenomena arise from electronic differences at the two oxygen sites within each unit cell. If the characteristics of the pseudogap seen here and by other techniques all have the same microscopic origin, this phase involves weak magnetic states at the O sites that break 90o -rotational symmetry within every CuO2 unit cell. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1007.3216v1-abstract-full').style.display = 'none'; document.getElementById('1007.3216v1-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 July, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2010. </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">See the Nature website for the published version. High-resolution version of figures, supplementary information and supplementary movies are available at http://eunahkim.ccmr.cornell.edu/KimGroup/highlights.html</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 466, 347, (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0911.3775">arXiv:0911.3775</a> <span> [<a href="https://arxiv.org/pdf/0911.3775">pdf</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> </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.1176369">10.1126/science.1176369 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spectroscopic Fingerprint of Phase-Incoherent Superconductivity in the Cuprate Pseudogap State </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+J">Jhinhwan Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Fujita%2C+K">K. Fujita</a>, <a href="/search/cond-mat?searchtype=author&query=Schmidt%2C+A+R">A. R. Schmidt</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chung Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Eisaki%2C+H">H. Eisaki</a>, <a href="/search/cond-mat?searchtype=author&query=Uchida%2C+S">S. Uchida</a>, <a href="/search/cond-mat?searchtype=author&query=Davis%2C+J+C">J. C. Davis</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="0911.3775v1-abstract-short" style="display: inline;"> A possible explanation for the existence of the cuprate "pseudogap" state is that it is a d-wave superconductor without quantum phase rigidity. Transport and thermodynamic studies provide compelling evidence that supports this proposal, but few spectroscopic explorations of it have been made. One spectroscopic signature of d-wave superconductivity is the particle-hole symmetric "octet" of disper… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0911.3775v1-abstract-full').style.display = 'inline'; document.getElementById('0911.3775v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0911.3775v1-abstract-full" style="display: none;"> A possible explanation for the existence of the cuprate "pseudogap" state is that it is a d-wave superconductor without quantum phase rigidity. Transport and thermodynamic studies provide compelling evidence that supports this proposal, but few spectroscopic explorations of it have been made. One spectroscopic signature of d-wave superconductivity is the particle-hole symmetric "octet" of dispersive Bogoliubov quasiparticle interference modulations. Here we report on this octet's evolution from low temperatures to well into the underdoped pseudogap regime. No pronounced changes occur in the octet phenomenology at the superconductor's critical temperature Tc, and it survives up to at least temperature T ~ 1.5Tc. In the pseudogap regime, we observe the detailed phenomenology that was theoretically predicted for quasiparticle interference in a phase-incoherent d-wave superconductor. Thus, our results not only provide spectroscopic evidence to confirm and extend the transport and thermodynamics studies, but they also open the way for spectroscopic explorations of phase fluctuation rates, their effects on the Fermi arc, and the fundamental source of the phase fluctuations that suppress superconductivity in underdoped cuprates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0911.3775v1-abstract-full').style.display = 'none'; document.getElementById('0911.3775v1-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 November, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2009. </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, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 325, 1099-1103 (2009) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0905.4817">arXiv:0905.4817</a> <span> [<a href="https://arxiv.org/pdf/0905.4817">pdf</a>, <a href="https://arxiv.org/ps/0905.4817">ps</a>, <a href="https://arxiv.org/format/0905.4817">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="Statistical Mechanics">cond-mat.stat-mech</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.81.020407">10.1103/PhysRevB.81.020407 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-field instability of field-induced triplon Bose-Einstein condensate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Rakhimov%2C+A">Abdulla Rakhimov</a>, <a href="/search/cond-mat?searchtype=author&query=Sherman%2C+E+Y">E. Ya. Sherman</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="0905.4817v2-abstract-short" style="display: inline;"> We study properties of magnetic field-induced Bose-Einstein condensate of triplons as a function of temperature and the field within the Hartree-Fock-Bogoliubov approach including the anomalous density. We show that the magnetization is continuous across the transition, in agreement with the experiment. In sufficiently strong fields the condensate becomes unstable due to triplon-triplon repulsio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0905.4817v2-abstract-full').style.display = 'inline'; document.getElementById('0905.4817v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0905.4817v2-abstract-full" style="display: none;"> We study properties of magnetic field-induced Bose-Einstein condensate of triplons as a function of temperature and the field within the Hartree-Fock-Bogoliubov approach including the anomalous density. We show that the magnetization is continuous across the transition, in agreement with the experiment. In sufficiently strong fields the condensate becomes unstable due to triplon-triplon repulsion. As a result, the system is characterized by two critical magnetic fields: one producing the condensate and the other destroying it. We show that nonparabolic triplon dispersion arising due to the gapped bare spectrum and the crystal structure has a strong influence on the phase diagram. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0905.4817v2-abstract-full').style.display = 'none'; document.getElementById('0905.4817v2-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 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 May, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2009. </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">published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 81, 020407(R) (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0901.2772">arXiv:0901.2772</a> <span> [<a href="https://arxiv.org/pdf/0901.2772">pdf</a>, <a href="https://arxiv.org/format/0901.2772">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="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.104.054301">10.1103/PhysRevLett.104.054301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Reverse Doppler Effect of Sound </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+H">Sam Hyeon Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Park%2C+C+M">Choon Mahn Park</a>, <a href="/search/cond-mat?searchtype=author&query=Seo%2C+Y+M">Yong Mun Seo</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z+G">Zhi Guo Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="0901.2772v2-abstract-short" style="display: inline;"> We report observation of reverse Doppler effect in a double negative acoustic metamaterial. The metamaterial exhibited negative phase velocity and positive group velocity. The dispersion relation is such that the wavelength corresponding to higher frequency is longer. We observed that the frequency was down-shifted for the approaching source, and up-shifted when the source receded. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0901.2772v2-abstract-full" style="display: none;"> We report observation of reverse Doppler effect in a double negative acoustic metamaterial. The metamaterial exhibited negative phase velocity and positive group velocity. The dispersion relation is such that the wavelength corresponding to higher frequency is longer. We observed that the frequency was down-shifted for the approaching source, and up-shifted when the source receded. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0901.2772v2-abstract-full').style.display = 'none'; document.getElementById('0901.2772v2-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 January, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 January, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 104, 054301 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0812.2954">arXiv:0812.2954</a> <span> [<a href="https://arxiv.org/pdf/0812.2954">pdf</a>, <a href="https://arxiv.org/format/0812.2954">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> <p class="title is-5 mathjax"> Negative Effective Density in An Acoustic Metamaterial </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+H">Sam Hyeon Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Park%2C+C+M">Choon Mahn Park</a>, <a href="/search/cond-mat?searchtype=author&query=Seo%2C+Y+M">Yong Mun Seo</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z+G">Zhi Guo Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="0812.2954v3-abstract-short" style="display: inline;"> We report theoretical and experimental results for a new type of homogenized acoustic metamaterials with negative effective mass density. We constructed one-dimensional metamaterial, which is a tube with an array of very thin elastic membranes placed inside. This structure exhibited negative effective density in the frequency range from 0 to 735 Hz. The experimental result is in excellent agreem… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0812.2954v3-abstract-full').style.display = 'inline'; document.getElementById('0812.2954v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0812.2954v3-abstract-full" style="display: none;"> We report theoretical and experimental results for a new type of homogenized acoustic metamaterials with negative effective mass density. We constructed one-dimensional metamaterial, which is a tube with an array of very thin elastic membranes placed inside. This structure exhibited negative effective density in the frequency range from 0 to 735 Hz. The experimental result is in excellent agreement with our theoretical model that predicts negative effective density below a cut-off frequency. The frequency characteristics of this effective density is analogous to that of the permittivity of the electromagnetic plasma oscillation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0812.2954v3-abstract-full').style.display = 'none'; document.getElementById('0812.2954v3-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> 18 January, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 December, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. A 373 (2009) 4464-4469 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0812.2952">arXiv:0812.2952</a> <span> [<a href="https://arxiv.org/pdf/0812.2952">pdf</a>, <a href="https://arxiv.org/format/0812.2952">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/10.1088/0953-8984/21/17/175704">10.1088/0953-8984/21/17/175704 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Acoustic Metameterial with Negative Modulus </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+H">Sam Hyeon Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Park%2C+C+M">Choon Mahn Park</a>, <a href="/search/cond-mat?searchtype=author&query=Seo%2C+Y+M">Yong Mun Seo</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z+G">Zhi Guo Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="0812.2952v2-abstract-short" style="display: inline;"> We present experimental and theoretical results on an acoustic metamaterial that exhibits negative effective modulus in a frequency range from 0 to 450 Hz. One-dimensional acoustic metamaterial with an array of side holes on a tube was fabricated. We observed that acoustic waves above 450 Hz propagated well in this structure, but no sound below 450 Hz passed through. The frequency characteristic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0812.2952v2-abstract-full').style.display = 'inline'; document.getElementById('0812.2952v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0812.2952v2-abstract-full" style="display: none;"> We present experimental and theoretical results on an acoustic metamaterial that exhibits negative effective modulus in a frequency range from 0 to 450 Hz. One-dimensional acoustic metamaterial with an array of side holes on a tube was fabricated. We observed that acoustic waves above 450 Hz propagated well in this structure, but no sound below 450 Hz passed through. The frequency characteristics of the metamaterial has the same form as that of the permittivity in metals due to the plasma oscillation. We also provide a theory to explain the experimental results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0812.2952v2-abstract-full').style.display = 'none'; document.getElementById('0812.2952v2-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> 18 January, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 December, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 21(2009) 175704 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0801.1387">arXiv:0801.1387</a> <span> [<a href="https://arxiv.org/pdf/0801.1387">pdf</a>, <a href="https://arxiv.org/ps/0801.1387">ps</a>, <a href="https://arxiv.org/format/0801.1387">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-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/10.1103/PhysRevA.77.033626">10.1103/PhysRevA.77.033626 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Stability of the homogeneous Bose-Einstein condensate at large gas parameter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Rakhimov%2C+A">Abdulla Rakhimov</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Sang-Hoon Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Yee%2C+J+H">Jae Hyung Yee</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="0801.1387v2-abstract-short" style="display: inline;"> The properties of the uniform Bose gas is studied within the optimized variational perturbation theory (Gaussian approximation) in a self-consistent way. It is shown that the atomic BEC with a repulsive interaction becomes unstable when the gas parameter gamma=rho a^3 exceeds a critical value gamma_{crit} ~ 0.01. The quantum corrections beyond the Bogoliubov-Popov approximation to the energy den… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0801.1387v2-abstract-full').style.display = 'inline'; document.getElementById('0801.1387v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0801.1387v2-abstract-full" style="display: none;"> The properties of the uniform Bose gas is studied within the optimized variational perturbation theory (Gaussian approximation) in a self-consistent way. It is shown that the atomic BEC with a repulsive interaction becomes unstable when the gas parameter gamma=rho a^3 exceeds a critical value gamma_{crit} ~ 0.01. The quantum corrections beyond the Bogoliubov-Popov approximation to the energy density, chemical potential and pressure in powers of gamma expansions are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0801.1387v2-abstract-full').style.display = 'none'; document.getElementById('0801.1387v2-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> 12 January, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 January, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2008. </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">9 pages, 3 figures, Revtex</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0603479">arXiv:cond-mat/0603479</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0603479">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0603479">ps</a>, <a href="https://arxiv.org/format/cond-mat/0603479">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Ground state energy density of a dilute Bose gas in the canonical transformation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Sang-Hoon Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Das%2C+M+P">Mukunda P. Das</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="cond-mat/0603479v4-abstract-short" style="display: inline;"> A ground state energy density of an interacting dilute Bose gas system is studied in the canonical transformation scheme. It is shown that the transformation scheme enables us to calculate a higher order correction of order $n a^3$ in the particle depletion and ground state energy density of a dilute Bose gas system, which corresponds to the density fluctuation contribution from the excited stat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0603479v4-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0603479v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0603479v4-abstract-full" style="display: none;"> A ground state energy density of an interacting dilute Bose gas system is studied in the canonical transformation scheme. It is shown that the transformation scheme enables us to calculate a higher order correction of order $n a^3$ in the particle depletion and ground state energy density of a dilute Bose gas system, which corresponds to the density fluctuation contribution from the excited states. The coefficient of $n a^3$ term is shown to be $2(蟺- 8/3)$ for the particle depletion, and $16(蟺- 8/3)$ for the ground state energy density. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0603479v4-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0603479v4-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> 31 July, 2007; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 March, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2006. </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, 0 figure</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0603094">arXiv:cond-mat/0603094</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0603094">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0603094">ps</a>, <a href="https://arxiv.org/format/cond-mat/0603094">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="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/10.1088/0253-6102/48/3/016">10.1088/0253-6102/48/3/016 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electromagnetically induced transparency in an atom-molecule Bose-Einstein condensate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jin%2C+G">Guang-Ri Jin</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="cond-mat/0603094v1-abstract-short" style="display: inline;"> We propose a new measurement scheme for the atom-molecule dark state by using electromagnetically induced transparency (EIT) technique. Based on a density-matrix formalism, we calculate the absorption coefficient numerically. The appearance of the EIT dip in the spectra profile gives clear evidence for the creation of the dark state in the atom-molecule Bose-Einstein condensate. </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0603094v1-abstract-full" style="display: none;"> We propose a new measurement scheme for the atom-molecule dark state by using electromagnetically induced transparency (EIT) technique. Based on a density-matrix formalism, we calculate the absorption coefficient numerically. The appearance of the EIT dip in the spectra profile gives clear evidence for the creation of the dark state in the atom-molecule Bose-Einstein condensate. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0603094v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0603094v1-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 March, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2006. </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">3.7pages, 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/cond-mat/0504381">arXiv:cond-mat/0504381</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0504381">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0504381">ps</a>, <a href="https://arxiv.org/format/cond-mat/0504381">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="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/10.1103/PhysRevA.72.045602">10.1103/PhysRevA.72.045602 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum Dynamics and Statistics Properties of Atom-Molecule Bose-Einstein Condensate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jin%2C+G">Guang-Ri Jin</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="cond-mat/0504381v2-abstract-short" style="display: inline;"> Based on a two-mode boson model, we study nonclassical properties of the atom-molecule Bose-Einstein condensate. The effects of nonlinear collisions on the dynamics of the molecular formation is studied both in classical and quantum treatments. We find that the conversion from atoms to molecules can be suppressed strongly due to nonlinearity-induced localization of the atomic population. In addi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0504381v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0504381v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0504381v2-abstract-full" style="display: none;"> Based on a two-mode boson model, we study nonclassical properties of the atom-molecule Bose-Einstein condensate. The effects of nonlinear collisions on the dynamics of the molecular formation is studied both in classical and quantum treatments. We find that the conversion from atoms to molecules can be suppressed strongly due to nonlinearity-induced localization of the atomic population. In addition, we study statistical properties of the atom-molecule condensed system by calculating the intensity correlation functions numerically. We find that the effect of nonlinearity leads to the appearance of superchaotic molecular pulses, while maintaining the atomic field sub-Poissonian. The joint quantum statistical properties of the atoms and the molecules always show anti-bunching. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0504381v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0504381v2-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 September, 2005; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 April, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2005. </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">4 pages, 2 figures (to be published in 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 72, 045602 (2005) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/quant-ph/0412153">arXiv:quant-ph/0412153</a> <span> [<a href="https://arxiv.org/pdf/quant-ph/0412153">pdf</a>, <a href="https://arxiv.org/ps/quant-ph/0412153">ps</a>, <a href="https://arxiv.org/format/quant-ph/0412153">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="Other Condensed Matter">cond-mat.other</span> <span class="tag is-small is-grey 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/10.1103/PhysRevA.72.045601">10.1103/PhysRevA.72.045601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Modulational instability of two-component Bose-Einstein condensates in an optical lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jin%2C+G">Guang-Ri Jin</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="quant-ph/0412153v2-abstract-short" style="display: inline;"> We study modulational instability of two-component Bose-Einstein condensates in an optical lattice, which is modelled as a coupled discrete nonlinear Schr 枚dinger equation. The excitation spectrum and the modulational instability condition of the total system are presented analytically. In the long-wavelength limit, our results agree with the homogeneous two-component Bose-Einstein condensates c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('quant-ph/0412153v2-abstract-full').style.display = 'inline'; document.getElementById('quant-ph/0412153v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="quant-ph/0412153v2-abstract-full" style="display: none;"> We study modulational instability of two-component Bose-Einstein condensates in an optical lattice, which is modelled as a coupled discrete nonlinear Schr 枚dinger equation. The excitation spectrum and the modulational instability condition of the total system are presented analytically. In the long-wavelength limit, our results agree with the homogeneous two-component Bose-Einstein condensates case. The discreteness effects result in the appearance of the modulational instability for the condensates in miscible region. The numerical calculations confirm our analytical results and show that the interspecies coupling can transfer the instability from one component to another. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('quant-ph/0412153v2-abstract-full').style.display = 'none'; document.getElementById('quant-ph/0412153v2-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 September, 2005; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 December, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2004. </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">4 pages, 3 figures (to be published in 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 72, 045601 (2005) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0412502">arXiv:cond-mat/0412502</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0412502">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0412502">ps</a>, <a href="https://arxiv.org/format/cond-mat/0412502">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="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.71.205313">10.1103/PhysRevB.71.205313 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Fano resonance in electron transport through parallel double quantum dots in the Kondo regime </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ding%2C+G">Guo-Hui Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">C. K. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">K. Nahm</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="cond-mat/0412502v2-abstract-short" style="display: inline;"> Electron transport through parallel double quantum dot system with interdot tunneling and strong on-site Coulomb interaction is studied in the Kondo regime by using the finite-$U$ slave boson technique. For a system of quantum dots with degenerate energy levels, the linear conductance reaches the unitary limit ($2e^2/h$) due to the Kondo effect at low temperature when the interdot tunneling is a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0412502v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0412502v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0412502v2-abstract-full" style="display: none;"> Electron transport through parallel double quantum dot system with interdot tunneling and strong on-site Coulomb interaction is studied in the Kondo regime by using the finite-$U$ slave boson technique. For a system of quantum dots with degenerate energy levels, the linear conductance reaches the unitary limit ($2e^2/h$) due to the Kondo effect at low temperature when the interdot tunneling is absent. As the interdot tunneling amplitude increases, the conductance decreases in the singly occupied regime and a conductance plateau structure appears. In the crossover to the doubly occupied regime, the conductance increases to reach the maximum value of $G=2e^2/h$. For parallel double dots with different energy levels, we show that the interference effect plays an important role in the electron transport. The linear conductance is shown to have an asymmetric line shape of the Fano resonance as a function of gate voltage. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0412502v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0412502v2-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, 2005; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 December, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2004. </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 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/cond-mat/0412189">arXiv:cond-mat/0412189</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0412189">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0412189">ps</a>, <a href="https://arxiv.org/format/cond-mat/0412189">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> </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.72.085333">10.1103/PhysRevB.72.085333 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Diamagnetic response of Aharonov-Bohm rings: Impurity backward scatterings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+M+D">Mun Dae Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="cond-mat/0412189v2-abstract-short" style="display: inline;"> We report a theoretical calculation on the persistent currents of disordered normal-metal rings. It is shown that the diamagnetic responses of the rings in the vicinity of the zero magnetic field are attributed to multiple backward scatterings off the impurities. We observe the transition from the paramagnetic response to the diamagnetic one as the strength of disorder grows using both the analy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0412189v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0412189v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0412189v2-abstract-full" style="display: none;"> We report a theoretical calculation on the persistent currents of disordered normal-metal rings. It is shown that the diamagnetic responses of the rings in the vicinity of the zero magnetic field are attributed to multiple backward scatterings off the impurities. We observe the transition from the paramagnetic response to the diamagnetic one as the strength of disorder grows using both the analytic calculation and the numerical exact diagonalization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0412189v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0412189v2-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 October, 2005; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 December, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2004. </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">final version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 72, 085333 (2005) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0408630">arXiv:cond-mat/0408630</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0408630">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0408630">ps</a>, <a href="https://arxiv.org/format/cond-mat/0408630">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="High Energy Physics - Theory">hep-th</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.71.024518">10.1103/PhysRevB.71.024518 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ginzburg Landau theory of superconductivity at fractal dimensions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Rakhimov%2C+A">A. Rakhimov</a>, <a href="/search/cond-mat?searchtype=author&query=Yee%2C+J+H">Jae Hyung Yee</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="cond-mat/0408630v1-abstract-short" style="display: inline;"> The post Gaussian effective potential in $D=2+2\veps$ dimensions is evaluated for the Ginzburg-Landau theory of superconductivity. Two and three loop integrals for the post Gaussian correction terms in $D=2+2\veps$ dimensions are calculated and $\veps$-expansion for these integrals are constructed. In $D=2+2\veps$ fractal dimensions Ginzburg Landau parameter turned out to be sensitive to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0408630v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0408630v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0408630v1-abstract-full" style="display: none;"> The post Gaussian effective potential in $D=2+2\veps$ dimensions is evaluated for the Ginzburg-Landau theory of superconductivity. Two and three loop integrals for the post Gaussian correction terms in $D=2+2\veps$ dimensions are calculated and $\veps$-expansion for these integrals are constructed. In $D=2+2\veps$ fractal dimensions Ginzburg Landau parameter turned out to be sensitive to $\veps$ and the contribution of the post Gaussian term is larger than that for D=3. Adjusting $\veps$ to the recent experimental data on $魏(T)$ for high -$T_c$ cuprate superconductor $Tl_2Ca_2Ba_2Cu_3O_{10} (T\cl-2223)$, we found that $\veps=0.21$ is the best choice for this material. The result clearly shows that, in order to understand high - $T_c$ superconductivity, it is necessary to include the fluctuation contribution as well as the contribution from the dimensionality of the sample. The method gives a theoretical tool to estimate the effective dimensionality of the samples. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0408630v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0408630v1-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> 28 August, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2004. </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, RevTex</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev. B71 (2005) 024518 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0403728">arXiv:cond-mat/0403728</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0403728">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0403728">ps</a>, <a href="https://arxiv.org/format/cond-mat/0403728">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="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/10.1140/epjb/e2005-00069-7">10.1140/epjb/e2005-00069-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Rayleigh-Schroedinger-Goldstone variational perturbation theory for many fermion systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=You%2C+S+K">Sang Koo You</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="cond-mat/0403728v1-abstract-short" style="display: inline;"> We present a Rayleigh-Schroedinger-Goldstone perturbation formalism for many fermion systems. Based on this formalism, variational perturbation scheme which goes beyond the Gaussian approximation is developed. In order to go beyond the Gaussian approximation, we identify a parent Hamiltonian which has an effective Gaussian vacuum as a variational solution and carry out further perturbation with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0403728v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0403728v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0403728v1-abstract-full" style="display: none;"> We present a Rayleigh-Schroedinger-Goldstone perturbation formalism for many fermion systems. Based on this formalism, variational perturbation scheme which goes beyond the Gaussian approximation is developed. In order to go beyond the Gaussian approximation, we identify a parent Hamiltonian which has an effective Gaussian vacuum as a variational solution and carry out further perturbation with respect to the renormalized interaction using Goldstone's expansion. Perturbation rules for the ground state wavefunctional and energy are found. Useful commuting relations between operators and the Gaussian wavefunctional are also found, which could reduce the calculational efforts substantially. As examples, we calculate the first order correction to the Gaussian wavefunctional and the second order correction to the ground state of an electron gas system with the Yukawa-type interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0403728v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0403728v1-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 March, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2004. </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">11pages, 1figure</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0311226">arXiv:cond-mat/0311226</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0311226">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0311226">ps</a>, <a href="https://arxiv.org/format/cond-mat/0311226">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="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-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/10.1140/epjb/e2004-00195-8">10.1140/epjb/e2004-00195-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Post Gaussian effective potential in the Ginzburg Landau theory of superconductivity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Rakhimov%2C+A">A. Rakhimov</a>, <a href="/search/cond-mat?searchtype=author&query=Yee%2C+J+H">Jae Hyung Yee</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="cond-mat/0311226v2-abstract-short" style="display: inline;"> The post Gaussian effective potential in D=3 dimensions and the Gaussian effective potential in D=2+epsilon are evaluated for the Ginzburg-Landau theory of superconductivity. It is shown that, the next order correction to the Gaussian approximation of the Ginzburg-Landau parameter (kappa) is significant, whereas contribution from the two dimensionality is rather small. This strongly indicates th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0311226v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0311226v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0311226v2-abstract-full" style="display: none;"> The post Gaussian effective potential in D=3 dimensions and the Gaussian effective potential in D=2+epsilon are evaluated for the Ginzburg-Landau theory of superconductivity. It is shown that, the next order correction to the Gaussian approximation of the Ginzburg-Landau parameter (kappa) is significant, whereas contribution from the two dimensionality is rather small. This strongly indicates that strong correlation plays a more dominant role than the two dimensionality does in high T_c superconductivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0311226v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0311226v2-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, 2004; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 November, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2003. </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, RevTeX, 4 figures, minor changes has been made</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur.Phys.J. B39 (2004) 301 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0307315">arXiv:cond-mat/0307315</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0307315">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0307315">ps</a>, <a href="https://arxiv.org/format/cond-mat/0307315">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Condensed Matter">cond-mat</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.68.174424">10.1103/PhysRevB.68.174424 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Kondo lattice model with a direct exchange interaction between localized moments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+M+D">Mun Dae Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Hong%2C+J">Jongbae Hong</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="cond-mat/0307315v2-abstract-short" style="display: inline;"> We study the Kondo lattice model with a direct antiferromagnetic exchange interaction between localized moments. Ferromagnetically long-range ordered state coexisting with the Kondo screening shows a continuous quantum phase transition to the Kondo singlet state. We obtain the value of the critical point where the magnetizations of the localized moments and the conduction electrons vanish. The m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0307315v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0307315v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0307315v2-abstract-full" style="display: none;"> We study the Kondo lattice model with a direct antiferromagnetic exchange interaction between localized moments. Ferromagnetically long-range ordered state coexisting with the Kondo screening shows a continuous quantum phase transition to the Kondo singlet state. We obtain the value of the critical point where the magnetizations of the localized moments and the conduction electrons vanish. The magnetization curves yield a universal critical exponent independent of the filling factors and the strength of the interaction between localized moments. It is shown that the direct exchange interaction between localized moments introduces another phase transition from an antiferromagnetic ordering to a ferromagnetic ordering for small Kondo exchange interaction. We also explain the local minimum of the Kondo temperature in recent experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0307315v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0307315v2-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> 21 November, 2003; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 July, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2003. </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, final version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 68, 174424 (2003) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0212557">arXiv:cond-mat/0212557</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0212557">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0212557">ps</a>, <a href="https://arxiv.org/format/cond-mat/0212557">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="High Energy Physics - Theory">hep-th</span> </div> </div> <p class="title is-5 mathjax"> The Functional Schr枚dinger Picture Approach to Many-Particle Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=You%2C+S+K">Sang Koo You</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="cond-mat/0212557v1-abstract-short" style="display: inline;"> A self-contained pedagogical introduction to the functional Schr枚dinger picture method of many-body theory is given at a level suitable for graduate students and also for many-body physicists who have not been exposed to the functional Schr枚dinger picture method previously. Mathematical tools necessary for the functional Schr枚dinger picture calculation are introduced. The method is first applied… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0212557v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0212557v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0212557v1-abstract-full" style="display: none;"> A self-contained pedagogical introduction to the functional Schr枚dinger picture method of many-body theory is given at a level suitable for graduate students and also for many-body physicists who have not been exposed to the functional Schr枚dinger picture method previously. Mathematical tools necessary for the functional Schr枚dinger picture calculation are introduced. The method is first applied to various condensed matter problems including the electron gas, the Hubbard model, the BCS superconductivity, and dilute bose gas within the variational approximation. It is shown that the variational approximation with the Gaussian trial functional invariably leads into the Hartree-Fock results for both zero and finite temperature cases. In order to go beyond the Gaussian results, concepts of variational and optimized perturbation theories are introduced using simple quantum mechanical languages. Then, the variational perturbation theory in the functional Schr枚dinger picture is applied to the $位蠁^4$ model to yield the effective potential to the third order. The optimized perturbation theory is also applied to the $位蠁^4$ model to yield a general expression up to the second order. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0212557v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0212557v1-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, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2002. </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">75 pages, Lecture notes given at Johannes Kepler Universit盲t-Linz in October and November 2002</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0204018">arXiv:cond-mat/0204018</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0204018">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0204018">ps</a>, <a href="https://arxiv.org/format/cond-mat/0204018">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="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> </div> </div> <p class="title is-5 mathjax"> Condensate of a charged boson fluid at non-integer dimensions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Sang-Hoon Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="cond-mat/0204018v1-abstract-short" style="display: inline;"> Condensate of a charged boson fluid at non-integer dimensions between 2 and 3 is studied. Interaction between particles is assumed to be Coulombic, and Bogoliubov approximation is applied for a weak coupling regime. The condensate and the superfluid fraction at finite temperatures and at non-integer dimensions are calculated. The theoretical results are compared with the superfluid densities of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0204018v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0204018v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0204018v1-abstract-full" style="display: none;"> Condensate of a charged boson fluid at non-integer dimensions between 2 and 3 is studied. Interaction between particles is assumed to be Coulombic, and Bogoliubov approximation is applied for a weak coupling regime. The condensate and the superfluid fraction at finite temperatures and at non-integer dimensions are calculated. The theoretical results are compared with the superfluid densities of superconducting films, which show a universal splitting behavior. The qualitative similarity between the charged boson fluid and the superconducting films gives a strong clue for the origin of the universality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0204018v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0204018v1-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> 31 March, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2002. </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, 8 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/cond-mat/0201487">arXiv:cond-mat/0201487</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0201487">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0201487">ps</a>, <a href="https://arxiv.org/format/cond-mat/0201487">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="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/10.1088/0953-8984/15/7/311">10.1088/0953-8984/15/7/311 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic Polarization Currents in Double Quantum Dot Devices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Cho%2C+S+Y">Sam Young Cho</a>, <a href="/search/cond-mat?searchtype=author&query=McKenzie%2C+R+H">Ross H. McKenzie</a>, <a href="/search/cond-mat?searchtype=author&query=Kang%2C+K">Kicheon Kang</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="cond-mat/0201487v1-abstract-short" style="display: inline;"> We investigate coherent electron transport through a parallel circuit of two quantum dots, each of which has a single tunable energy level. Electrons tunneling via each dot from the left lead interfere with each other at the right lead. It is shown that due to the quantum interference of tunneling electrons the double quantum dot device is magnetically polarized by coherent circulation of elec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0201487v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0201487v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0201487v1-abstract-full" style="display: none;"> We investigate coherent electron transport through a parallel circuit of two quantum dots, each of which has a single tunable energy level. Electrons tunneling via each dot from the left lead interfere with each other at the right lead. It is shown that due to the quantum interference of tunneling electrons the double quantum dot device is magnetically polarized by coherent circulation of electrons on the closed path through the dots and the leads. Varying the energy level of each dot one can make the magnetic states of the device to be either {\em up-}, {\em non-}, or {\em down-} polarization. It is shown that for experimentally accessible temperatures and applied biases the magnetic polarization currents should be sufficiently large to observe with current nanotechnology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0201487v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0201487v1-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, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2002. </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">4 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/cond-mat/0112455">arXiv:cond-mat/0112455</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0112455">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0112455">ps</a>, <a href="https://arxiv.org/format/cond-mat/0112455">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="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.65.115328">10.1103/PhysRevB.65.115328 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Impact of optical phonon scattering on magnetotransport in double-barrier heterostructures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+D+K">Dae Kwan Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Roblin%2C+P">Patrick Roblin</a>, <a href="/search/cond-mat?searchtype=author&query=Soh%2C+K">Kwang-Sup Soh</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="cond-mat/0112455v1-abstract-short" style="display: inline;"> The transport in double-barrier heterostructures of electrons interacting with longitudinal optical phonons in the presence of parallel electric and magnetic fields is analyzed theoretically with the aid of a 3-dimensional quantum transport simulator. Inter Landau state transitions induced by LO-phonon scattering-assisted resonant-tunneling is shown to be an important process with a probability… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0112455v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0112455v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0112455v1-abstract-full" style="display: none;"> The transport in double-barrier heterostructures of electrons interacting with longitudinal optical phonons in the presence of parallel electric and magnetic fields is analyzed theoretically with the aid of a 3-dimensional quantum transport simulator. Inter Landau state transitions induced by LO-phonon scattering-assisted resonant-tunneling is shown to be an important process with a probability comparable to that of intra Landau state scattering. Analysis of the current-voltage characteristics reveals also that the current peak is a periodic function of the inverse of the magnetic field, with a period dependent on the quasi-resonant energy level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0112455v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0112455v1-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 December, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2001. </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 and 5 figures. Accepted for publication in Phys. Rev. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0111102">arXiv:cond-mat/0111102</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0111102">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0111102">ps</a>, <a href="https://arxiv.org/format/cond-mat/0111102">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="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/PhysRevB.66.193308">10.1103/PhysRevB.66.193308 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Mesoscopic Luttinger Liquid Theory in an Aharonov-Bohm Ring </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+M+D">Mun Dae Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Cho%2C+S+Y">Sam Young Cho</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="cond-mat/0111102v2-abstract-short" style="display: inline;"> A careful study on the mesoscopic PC in a Luttinger liquid ring is carried out. It is shown that discreteness plays an important role in calculating the PC caused by the magnetic flux. At zero temperature, the current is shown to be independent of the interaction even when $g=g_2-g_4$ is not zero. The current becomes enhanced at finite temperatures comparing to the non-interacting case, when t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0111102v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0111102v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0111102v2-abstract-full" style="display: none;"> A careful study on the mesoscopic PC in a Luttinger liquid ring is carried out. It is shown that discreteness plays an important role in calculating the PC caused by the magnetic flux. At zero temperature, the current is shown to be independent of the interaction even when $g=g_2-g_4$ is not zero. The current becomes enhanced at finite temperatures comparing to the non-interacting case, when the parameter g is positive. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0111102v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0111102v2-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 September, 2002; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 November, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2001. </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">4 pages, 2 figures. Version to appear in PRB</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 66, 193308 (2002) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0110395">arXiv:cond-mat/0110395</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0110395">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0110395">ps</a>, <a href="https://arxiv.org/format/cond-mat/0110395">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> </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.65.245307">10.1103/PhysRevB.65.245307 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effects of broken time-reversal symmetry on transmission zeros in the Aharonov-Bohm interferometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+T">Tae-Suk Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Cho%2C+S+Y">Sam Young Cho</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Ryu%2C+C">Chang-Mo Ryu</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="cond-mat/0110395v2-abstract-short" style="display: inline;"> In this paper, we study the behavior of the transmission zeros in the closed Aharonov-Bohm(AB) interferometer with an embedded scattering center in one arm and the corresponding change in the transmission phase when the time-reversal symmetry is broken by magnetic fields. Specifically, we consider three embedded scattering centers: one discrete energy level, a double-barrier well, and a $t$-stub… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0110395v2-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0110395v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0110395v2-abstract-full" style="display: none;"> In this paper, we study the behavior of the transmission zeros in the closed Aharonov-Bohm(AB) interferometer with an embedded scattering center in one arm and the corresponding change in the transmission phase when the time-reversal symmetry is broken by magnetic fields. Specifically, we consider three embedded scattering centers: one discrete energy level, a double-barrier well, and a $t$-stub. We find the followings from our model study: (i) The transmission zeros are real when the AB flux is an integer or a half-integer multiple of the flux quantum, and the transmission phase jumps by $蟺$ at the zeros. (ii) The transmission zeros become complex or are shifted off the real-energy axis when the magnetic AB flux is not an integer or a half-integer multiple of the flux quantum, and the transmission phase evolves continuously. (iii) The distance of the zeros from the real-energy axis or the imaginary part of the transmission zeros is sinusoidal as a function of the magnetic AB phase. We suggest the experimental setup which can test our results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0110395v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0110395v2-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, 2002; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 October, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2001. </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">9 pages, 10 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 65, 245307 (2002) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0103153">arXiv:cond-mat/0103153</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0103153">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0103153">ps</a>, <a href="https://arxiv.org/format/cond-mat/0103153">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/10.1088/0953-8984/13/14/304">10.1088/0953-8984/13/14/304 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ferromagnetic Fixed Point of the Kondo Model in a Luttinger Liquid </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+M+D">Mun Dae Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</a>, <a href="/search/cond-mat?searchtype=author&query=Ryu%2C+C">Chang-Mo Ryu</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="cond-mat/0103153v1-abstract-short" style="display: inline;"> The Kondo effect in a Luttinger liquid is studied using the renormalization group method. By renormalizing the boson fields, scaling equations to the second order for an arbitrary Luttinger interaction are obtained. For the ferromagnetic Kondo coupling, a spin bound state(triplet) can be realized without invoking a nearest neighbor spin interaction in agreement with the recent Bethe ansatz calcu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0103153v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0103153v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0103153v1-abstract-full" style="display: none;"> The Kondo effect in a Luttinger liquid is studied using the renormalization group method. By renormalizing the boson fields, scaling equations to the second order for an arbitrary Luttinger interaction are obtained. For the ferromagnetic Kondo coupling, a spin bound state(triplet) can be realized without invoking a nearest neighbor spin interaction in agreement with the recent Bethe ansatz calculation. The scaling theory in the presence of the scalar potential shows that there is no interplay between the magnetic and non-magnetic interaction. Also a study on the crossover behavior of the Kondo temperature between the exponential and the power law type is presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0103153v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0103153v1-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, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2001. </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">9 pages, 2 figures. Accepted for publication in J. Phys.: Condens. Matter</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 13, 3271(2001) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0102224">arXiv:cond-mat/0102224</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0102224">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0102224">ps</a>, <a href="https://arxiv.org/format/cond-mat/0102224">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Condensed Matter">cond-mat</span> </div> </div> <p class="title is-5 mathjax"> Phase Diagram of a Two-Dimensional Neutral Classical Coulomb Gas from a Non-perturbative sine-Gordon Expansion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lu%2C+W">Wen-Fa Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="cond-mat/0102224v1-abstract-short" style="display: inline;"> Within the sine-Gordon formalism of a two-dimensional neutral classical Coulomb gas, a convergent expansion with non-perturbative nature is performed to calculate the thermodynamic potential and construct the phase diagram. It is shown that truncation at the first order yields the Gaussian approximation. The second- and third-order corrections are analyzed for the case of small fugacity and are… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0102224v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0102224v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0102224v1-abstract-full" style="display: none;"> Within the sine-Gordon formalism of a two-dimensional neutral classical Coulomb gas, a convergent expansion with non-perturbative nature is performed to calculate the thermodynamic potential and construct the phase diagram. It is shown that truncation at the first order yields the Gaussian approximation. The second- and third-order corrections are analyzed for the case of small fugacity and are shown that they substantially improve the Gaussian-approximation phase diagram. In particular, these corrections introduce a new conducting phase and make the insulator-conductor coexistence phase end at the conducting phase. The latter result is in agreement with the prediction made by generalized renormalization-group calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0102224v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0102224v1-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 February, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2001. </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, 1 figure (EPS), Revtex</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0011215">arXiv:cond-mat/0011215</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0011215">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0011215">ps</a>, <a href="https://arxiv.org/format/cond-mat/0011215">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="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.64.033314">10.1103/PhysRevB.64.033314 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spin Fluctuation and Persistent Current in a Mesoscopic Ring Coupled to a Quantum Dot </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Cho%2C+S+Y">Sam Young Cho</a>, <a href="/search/cond-mat?searchtype=author&query=Kang%2C+K">Kicheon Kang</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Ryu%2C+C">Chang-Mo Ryu</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="cond-mat/0011215v1-abstract-short" style="display: inline;"> We investigate the persistent current influenced by the spin fluctuations in a mesoscopic ring weakly coupled to a quantum dot. It is shown that the Kondo effect gives rise to some unusual features of the persistent current in the limit where the charge transfer between two subsystems is suppressed. Various aspects of the crossover from a delocalized to a localized dot limit are discussed in rel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0011215v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0011215v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0011215v1-abstract-full" style="display: none;"> We investigate the persistent current influenced by the spin fluctuations in a mesoscopic ring weakly coupled to a quantum dot. It is shown that the Kondo effect gives rise to some unusual features of the persistent current in the limit where the charge transfer between two subsystems is suppressed. Various aspects of the crossover from a delocalized to a localized dot limit are discussed in relation with the effect of the coherent response of the Kondo cloud to the Aharonov-Bohm flux. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0011215v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0011215v1-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 November, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2000. </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">4 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/cond-mat/0007282">arXiv:cond-mat/0007282</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0007282">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0007282">ps</a>, <a href="https://arxiv.org/format/cond-mat/0007282">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/PhysRevC.62.045503">10.1103/PhysRevC.62.045503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A variational perturbation scheme for many-particle systems in the functional integral approach </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=You%2C+S+K">Sang Koo You</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</a>, <a href="/search/cond-mat?searchtype=author&query=Noh%2C+H+S">Hyun Sik Noh</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="cond-mat/0007282v1-abstract-short" style="display: inline;"> A variational Perturbation theory based on the functional integral approach is formulated for many-particle systems. Using the variational action obtained through Jensen-Peierls' inequality, a perturbative expansion scheme for the thermodynamic potential is established. A modified Wick's theorem is obtained for the variational perturbation expansions. This theorem allows one to carry out systema… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0007282v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/0007282v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0007282v1-abstract-full" style="display: none;"> A variational Perturbation theory based on the functional integral approach is formulated for many-particle systems. Using the variational action obtained through Jensen-Peierls' inequality, a perturbative expansion scheme for the thermodynamic potential is established. A modified Wick's theorem is obtained for the variational perturbation expansions. This theorem allows one to carry out systematic calculations of higher order terms without worrying about the double counting problem. A model numerical calculation was carried out on a nucleon gas system interacting through the Yukawa-type potential to test the efficiency of the present method. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0007282v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0007282v1-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 July, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2000. </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 for publication in Phys. Rev. C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/9908086">arXiv:cond-mat/9908086</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9908086">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/9908086">ps</a>, <a href="https://arxiv.org/format/cond-mat/9908086">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</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/10.1088/0953-8984/11/50/319">10.1088/0953-8984/11/50/319 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ideal Bose gas in fractal dimensions and superfluid $^4$He in porous media </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Sang-Hoon Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="cond-mat/9908086v1-abstract-short" style="display: inline;"> Physical properties of ideal Bose gas with the fractal dimensionality between D=2 and D=3 are theoretically investigated. Calculation shows that the characteristic features of the specific heat and the superfluid density of ideal Bose gas in fractal dimensions are strikingly similar to those of superfluid Helium-4 in porous media. This result indicates that the geometrical factor is dominant ove… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9908086v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/9908086v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9908086v1-abstract-full" style="display: none;"> Physical properties of ideal Bose gas with the fractal dimensionality between D=2 and D=3 are theoretically investigated. Calculation shows that the characteristic features of the specific heat and the superfluid density of ideal Bose gas in fractal dimensions are strikingly similar to those of superfluid Helium-4 in porous media. This result indicates that the geometrical factor is dominant over mutual interactions in determining physical properties of Helium-4 in porous media. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9908086v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9908086v1-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 August, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 1999. </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, 6 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/cond-mat/9808281">arXiv:cond-mat/9808281</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9808281">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/9808281">ps</a>, <a href="https://arxiv.org/format/cond-mat/9808281">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Condensed Matter">cond-mat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantitative Biology">q-bio</span> </div> </div> <p class="title is-5 mathjax"> Fractional Populations in Sex-linked Inheritance </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+P">Seung Pyo Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Chung%2C+M">Myung-Hoon Chung</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="cond-mat/9808281v1-abstract-short" style="display: inline;"> We study the fractional populations in chromosome inherited diseases. The governing equations for the fractional populations are found and solved in the presence of mutation and selection. The physical fixed points obtained are used to discuss the cases of color blindness and hemophilia. </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9808281v1-abstract-full" style="display: none;"> We study the fractional populations in chromosome inherited diseases. The governing equations for the fractional populations are found and solved in the presence of mutation and selection. The physical fixed points obtained are used to discuss the cases of color blindness and hemophilia. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9808281v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9808281v1-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 August, 1998; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 1998. </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">9 pages, 1 figure and RevTeX 3.0</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/9808233">arXiv:cond-mat/9808233</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9808233">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/9808233">ps</a>, <a href="https://arxiv.org/format/cond-mat/9808233">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Fluctuation correction to the ground state energy density of a dilute Bose gas in the functional Schr枚dinger picture </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Sang-Hoon Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Noh%2C+H+S">Hyun Sik Noh</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+D+K">Dae Kwan Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Nahm%2C+K">Kyun Nahm</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="cond-mat/9808233v1-abstract-short" style="display: inline;"> A dilute Bose gas system is studied using the functional Schr枚dinger picture theory. The ground state properties are obtained by solving the infinite dimensional Schr枚dinger equation variationally. It is shown that a shifted Gaussian trial wavefunctional enables us to calculate a higher order correction, which corresponds to the fluctuation contribution from the condensate. The obtained term is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9808233v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/9808233v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9808233v1-abstract-full" style="display: none;"> A dilute Bose gas system is studied using the functional Schr枚dinger picture theory. The ground state properties are obtained by solving the infinite dimensional Schr枚dinger equation variationally. It is shown that a shifted Gaussian trial wavefunctional enables us to calculate a higher order correction, which corresponds to the fluctuation contribution from the condensate. The obtained term is compared with the quantum correction arising from the low energy $3 \to 3$ scattering. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9808233v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9808233v1-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> 21 August, 1998; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 1998. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/9802272">arXiv:cond-mat/9802272</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9802272">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/9802272">ps</a>, <a href="https://arxiv.org/format/cond-mat/9802272">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="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/10.1142/S0217984999001135">10.1142/S0217984999001135 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multi-anyons in the magnetic field </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Choi%2C+T">Taeseung Choi</a>, <a href="/search/cond-mat?searchtype=author&query=Ryu%2C+C">Chang-Mo Ryu</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="cond-mat/9802272v1-abstract-short" style="display: inline;"> We consider the external magnetic field effects on the two types of anyon with fractional statistical parameters $p/q$ with coprimes $p$ and $q$, one with fractional charge $e/q $ and flux $p 蠁_0(=hc/e)$(type I), the other with fractional flux $p 蠁_0/q$ and fundamental charge $e$(type II). These two-types of anyons show different behaviors in the presence of the external magnetic field. We also… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9802272v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/9802272v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9802272v1-abstract-full" style="display: none;"> We consider the external magnetic field effects on the two types of anyon with fractional statistical parameters $p/q$ with coprimes $p$ and $q$, one with fractional charge $e/q $ and flux $p 蠁_0(=hc/e)$(type I), the other with fractional flux $p 蠁_0/q$ and fundamental charge $e$(type II). These two-types of anyons show different behaviors in the presence of the external magnetic field. We also considered the geometry in which a two-dimensional plane contains an island of anyons with different statistical parameter in their equilibrium. The equilibrium inside an island is shown to be periodic with respect to the flux through the island. The period for the type I anyon equals to the integer multiple of the fundamental flux quantum. In the case of type II anyon the period is found to be the fractional multiple of the fundamental flux quantum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9802272v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9802272v1-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 February, 1998; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 1998. </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">revtex, no 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/hep-th/9709092">arXiv:hep-th/9709092</a> <span> [<a href="https://arxiv.org/pdf/hep-th/9709092">pdf</a>, <a href="https://arxiv.org/ps/hep-th/9709092">ps</a>, <a href="https://arxiv.org/format/hep-th/9709092">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Condensed Matter">cond-mat</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/10.1088/0305-4470/31/28/016">10.1088/0305-4470/31/28/016 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The O(N) Nonlinear Sigma Model in the Functional Schr枚dinger Picture </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+D+K">Dae Kwan Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="hep-th/9709092v1-abstract-short" style="display: inline;"> We present a functional Schr枚dinger picture formalism of the (1+1)-dimensional $O(N) $ nonlinear sigma model. The energy density has been calculated to two-loop order using the wave functional of a gaussian form, and from which the nonperturbative mass gap of the boson fields has been obtained. The functional Schr枚dinger picture approach combined with the variational technique is shownto describ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-th/9709092v1-abstract-full').style.display = 'inline'; document.getElementById('hep-th/9709092v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-th/9709092v1-abstract-full" style="display: none;"> We present a functional Schr枚dinger picture formalism of the (1+1)-dimensional $O(N) $ nonlinear sigma model. The energy density has been calculated to two-loop order using the wave functional of a gaussian form, and from which the nonperturbative mass gap of the boson fields has been obtained. The functional Schr枚dinger picture approach combined with the variational technique is shownto describe the characteristics of the ground state of the nonlinear sigma model in a transparent way. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-th/9709092v1-abstract-full').style.display = 'none'; document.getElementById('hep-th/9709092v1-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, 1997; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 1997. </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, no figures, Latex file</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> YUMS-97-26/SNUTP-97-129 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J.Phys.A31:6029-6036,1998 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/9703101">arXiv:cond-mat/9703101</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/9703101">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/9703101">ps</a>, <a href="https://arxiv.org/format/cond-mat/9703101">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> <p class="title is-5 mathjax"> Finite temperature many-particle theory of condensed matter systems in the functional Schroedinger picture </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Noh%2C+H+S">Hyun Sik Noh</a>, <a href="/search/cond-mat?searchtype=author&query=You%2C+S+K">Sang Koo You</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+C+K">Chul Koo Kim</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="cond-mat/9703101v1-abstract-short" style="display: inline;"> A finite temperature many-particle theory of condensed matter systems is formulated using the functional Schroedinger picture. Using the interacting electron gas as a model system, we solve the equation of motion for the density matrix variationally with a Gaussian type trial density matrix. We show that the present formalism yields the finite temperature Hartree-Fock results both for the para-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9703101v1-abstract-full').style.display = 'inline'; document.getElementById('cond-mat/9703101v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/9703101v1-abstract-full" style="display: none;"> A finite temperature many-particle theory of condensed matter systems is formulated using the functional Schroedinger picture. Using the interacting electron gas as a model system, we solve the equation of motion for the density matrix variationally with a Gaussian type trial density matrix. We show that the present formalism yields the finite temperature Hartree-Fock results both for the para- and ferromagnetic states in a simple and convenient fashion. Implications of the present results and future prospects are also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/9703101v1-abstract-full').style.display = 'none'; document.getElementById('cond-mat/9703101v1-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 March, 1997; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 1997. </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">12pages, to appear in Int. J. Mod. Phys. B</span> </p> </li> </ol> <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> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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