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</div> <div class="control"> <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/2408.15464">arXiv:2408.15464</a> <span> [<a href="https://arxiv.org/pdf/2408.15464">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Ultrafast symmetry control in photoexcited quantum dots </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guzelturk%2C+B">Burak Guzelturk</a>, <a href="/search/physics?searchtype=author&query=Portner%2C+J">Joshua Portner</a>, <a href="/search/physics?searchtype=author&query=Ondry%2C+J">Justin Ondry</a>, <a href="/search/physics?searchtype=author&query=Ghanbarzadeh%2C+S">Samira Ghanbarzadeh</a>, <a href="/search/physics?searchtype=author&query=Tarantola%2C+M">Mia Tarantola</a>, <a href="/search/physics?searchtype=author&query=Jeong%2C+A">Ahhyun Jeong</a>, <a href="/search/physics?searchtype=author&query=Field%2C+T">Thomas Field</a>, <a href="/search/physics?searchtype=author&query=Chandler%2C+A+M">Alicia M. Chandler</a>, <a href="/search/physics?searchtype=author&query=Wieman%2C+E">Eliza Wieman</a>, <a href="/search/physics?searchtype=author&query=Hopper%2C+T+R">Thomas R. Hopper</a>, <a href="/search/physics?searchtype=author&query=Watkins%2C+N+E">Nicolas E. Watkins</a>, <a href="/search/physics?searchtype=author&query=Yue%2C+J">Jin Yue</a>, <a href="/search/physics?searchtype=author&query=Cheng%2C+X">Xinxin Cheng</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+M">Ming-Fu Lin</a>, <a href="/search/physics?searchtype=author&query=Luo%2C+D">Duan Luo</a>, <a href="/search/physics?searchtype=author&query=Kramer%2C+P+L">Patrick L. Kramer</a>, <a href="/search/physics?searchtype=author&query=Shen%2C+X">Xiaozhe Shen</a>, <a href="/search/physics?searchtype=author&query=Reid%2C+A+H">Alexander H. Reid</a>, <a href="/search/physics?searchtype=author&query=Borkiewicz%2C+O">Olaf Borkiewicz</a>, <a href="/search/physics?searchtype=author&query=Ruett%2C+U">Uta Ruett</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+X">Xiaoyi Zhang</a>, <a href="/search/physics?searchtype=author&query=Lindenberg%2C+A+M">Aaron M. Lindenberg</a>, <a href="/search/physics?searchtype=author&query=Ma%2C+J">Jihong Ma</a>, <a href="/search/physics?searchtype=author&query=Schaller%2C+R">Richard Schaller</a>, <a href="/search/physics?searchtype=author&query=Talapin%2C+D+V">Dmitri V. Talapin</a> , et al. (1 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.15464v1-abstract-short" style="display: inline;"> Symmetry control is essential for realizing unconventional properties, such as ferroelectricity, nonlinear optical responses, and complex topological order, thus it holds promise for the design of emerging quantum and photonic systems. Nevertheless, fast and reversible control of symmetry in materials remains a challenge, especially for nanoscale systems. Here, we unveil reversible symmetry change… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.15464v1-abstract-full').style.display = 'inline'; document.getElementById('2408.15464v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.15464v1-abstract-full" style="display: none;"> Symmetry control is essential for realizing unconventional properties, such as ferroelectricity, nonlinear optical responses, and complex topological order, thus it holds promise for the design of emerging quantum and photonic systems. Nevertheless, fast and reversible control of symmetry in materials remains a challenge, especially for nanoscale systems. Here, we unveil reversible symmetry changes in colloidal lead chalcogenide quantum dots on picosecond timescales. Using a combination of ultrafast electron diffraction and total X-ray scattering, in conjunction with atomic-scale structural modeling and first-principles calculations, we reveal that symmetry-broken lead sulfide quantum dots restore to a centrosymmetric phase upon photoexcitation. The symmetry restoration is driven by photoexcited electronic carriers, which suppress lead off-centering for about 100 ps. Furthermore, the change in symmetry is closely correlated with the electronic properties as shown by transient optical measurements. Overall, this study elucidates reversible symmetry changes in colloidal quantum dots, and more broadly defines a new methodology to optically control symmetry in nanoscale systems on ultrafast timescales. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.15464v1-abstract-full').style.display = 'none'; document.getElementById('2408.15464v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 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/2002.05286">arXiv:2002.05286</a> <span> [<a href="https://arxiv.org/pdf/2002.05286">pdf</a>, <a href="https://arxiv.org/format/2002.05286">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </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/10.1364/OE.389653">10.1364/OE.389653 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Enabling high repetition rate nonlinear THz science with a kilowatt-class sub-100 fs laser source </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kramer%2C+P+L">Patrick L. Kramer</a>, <a href="/search/physics?searchtype=author&query=Windeler%2C+M">Matthew Windeler</a>, <a href="/search/physics?searchtype=author&query=Mecseki%2C+K">Katalin Mecseki</a>, <a href="/search/physics?searchtype=author&query=Champenois%2C+E+G">Elio G. Champenois</a>, <a href="/search/physics?searchtype=author&query=Hoffmann%2C+M+C">Matthias C. Hoffmann</a>, <a href="/search/physics?searchtype=author&query=Tavella%2C+F">Franz Tavella</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="2002.05286v1-abstract-short" style="display: inline;"> Manipulating the atomic and electronic structure of matter with strong terahertz (THz) fields while probing the response with ultrafast pulses at x-ray free electron lasers (FELs) has offered unique insights into a multitude of physical phenomena in solid state and atomic physics. Recent upgrades of x-ray FEL facilities are pushing to much higher repetition rates, enabling unprecedented signal to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.05286v1-abstract-full').style.display = 'inline'; document.getElementById('2002.05286v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.05286v1-abstract-full" style="display: none;"> Manipulating the atomic and electronic structure of matter with strong terahertz (THz) fields while probing the response with ultrafast pulses at x-ray free electron lasers (FELs) has offered unique insights into a multitude of physical phenomena in solid state and atomic physics. Recent upgrades of x-ray FEL facilities are pushing to much higher repetition rates, enabling unprecedented signal to noise for pump probe experiments. This requires the development of suitable THz pump sources that are able to deliver intense pulses at compatible repetition rates. Here we present a high power laser-driven THz source based on optical rectification in LiNbO3 using tilted pulse front pumping. Our source is driven by a kilowatt-level Yb:YAG amplifier system operating at 100 kHz repetition rate and employing nonlinear spectral broadening and recompression to achieve sub-100 fs pulses at 1030 nm wavelength. We demonstrate a maximum of 144 mW average THz power (1.44 uJ pulse energy), consisting of single-cycle pulses centered at 0.6 THz with a peak electric field strength exceeding 150 kV/cm. These high field pulses open up a range of possibilities for nonlinear time-resolved experiments with x-ray probing at unprecedented rates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.05286v1-abstract-full').style.display = 'none'; document.getElementById('2002.05286v1-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 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">17 pages, 10 figures</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> 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