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X-WR-CALNAME:Stewart Blusson Quantum Matter Institute
X-ORIGINAL-URL:https://qmi.miffanytark.com
X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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DTSTART;TZID=America/Vancouver:20260505T140000
DTEND;TZID=America/Vancouver:20260505T150000
DTSTAMP:20260427T231043Z
CREATED:20260427T231043Z
LAST-MODIFIED:20260427T231043Z
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SUMMARY:Special Seminar: Fractionalized theory for intertwined orders and hole pockets in the cuprate pseudogap\, Subir Sachdev\, Harvard University
DESCRIPTION:Speaker: Subir Sachdev\, Harvard University \nTime: 2:00-3:00pm \nLocation: BRIM 311 \nTitle: Fractionalized theory for intertwined orders and hole pockets in the cuprate pseudogap \nAbstract: I review old and recent experimental results on the enigmatic pseudogap phase of the hole-doped cuprates. I argue that the evidence implies an underlying metallic state with hole pockets which have a non-Luttinger area enclosed by the Fermi surface. Such a state must also feature a quantum spin liquid with fractionalization. I describe how the intertwined d-wave superconductivity and charge orders emerge from a fractionalized perspective. 
URL:https://qmi.miffanytark.com/event/special-seminar-fractionalized-theory-for-intertwined-orders-and-hole-pockets-in-the-cuprate-pseudogap-subir-sachdev-harvard-university/
CATEGORIES:Other seminars
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20240717T090000
DTEND;TZID=America/Vancouver:20240717T100000
DTSTAMP:20240716T230944Z
CREATED:20240716T230944Z
LAST-MODIFIED:20240716T230944Z
UID:7693-1721206800-1721210400@qmi.miffanytark.com
SUMMARY:Special Seminar: Wolf Widdra - Institute of Physics\, Martin-Luther-Universität Halle-Wittenberg: Laser-based double photoemission spectroscopy at surfaces
DESCRIPTION:Abstract: \nWith the recent progress in high-order harmonic generation (HHG) using femtosecond lasers\, laboratory photoelectron spectroscopy with an ultrafast\, widely tunable vacuum-ultraviolet light source has become available. Whereas HHG-based photoemission experiments at kilohertz repetition rates have been severely limited by the space-charge effects in the past\, the new development of compact HHG light sources with megahertz repetition rates allows for efficient photoemission and double photoemission experiments as is demonstrated here [1-7].\nI will present momentum-resolved photoemission experiments with photon energies between 14 and 40 eV that demonstrate the high performance of the setup [3\,4\,6]. In addition\, the combination of two time-of-flight spectrometers with coincidence detection electronics opens the way for efficient and long-term stable double photoemission experiments at variable photon energies [1\,6-8]. For the noble metal (001) surface of Ag\, we present a detailed analysis of double photoemission data and will compare them with similar data for the NiO(001) surface. The electron-electron pair distribution shows a sharp sum-energy onset\, which corresponds to one hole in the Ag 3d band (4.5 eV below the Fermi level) and a second excitation from the Ag sp band. Simultaneously\, an intense energy sharing between the electrons in the pair is visible indicating strong electron-electron correlations [5]. For thin films of C60\, a molecular-orbital resolved correlation energy is determined based on double photoemission data at various photon energies. \nReferences:\n[1]    M. Huth\, C.-T. Chiang\, A. Trützschler\, F. O. Schumann\, J. Kirschner\, and W. Widdra; Applied Physics Letters 104\, 061602 (2014).\n[2]    A. Blättermann\, C.-T. Chiang\, and W. Widdra; Physical Review A 89\, 043404 (2014).\n[3]    C.-T. Chiang\, M. Huth\, A. Trützschler\, M. Kiel\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, New Journal of Physics 17\, 013035 (2015).\n[4]    C.-T. Chiang\, M. Huth\, A. Trützschler\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, Electron Spectroscopy and Related Phenomena 200\, 15-21(2015).\n[5]     A. Trützschler\, M. Huth\, C.-T. Chiang\, R. Kamrla\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, Phys. Rev. Lett. 118\, 136401(2017).\n[6]    M. Huth\, A. Trützschler\, C.-T. Chiang\, R. Kamrla\, F. O. Schumann\, and W. Widdra\, J. Appl. Phys. 124\, 164504 (2018).\n[7]     C.-T. Chiang\, A. Trützschler\, M. Huth\, R. Kamrla\, F. O. Schumann\, and W. Widdra\, Prog. Surf. Sci. 95\, 100572 (2020). \n  \nSpeaker Bio: Prof. Wolf Widdra is a Professor at the the Institute of Physics\, Martin-Luther-Universität Halle-Wittenberg\, Halle\, Germany. \n 
URL:https://qmi.miffanytark.com/event/special-seminar-wolf-widdra-institute-of-physics-martin-luther-universitat-halle-wittenberg-laser-based-double-photoemission-spectroscopy-at-surfaces/
CATEGORIES:Other seminars,UBC event
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221026T120000
DTEND;TZID=America/Vancouver:20221026T150000
DTSTAMP:20221013T230427Z
CREATED:20221013T230427Z
LAST-MODIFIED:20221013T230427Z
UID:4985-1666785600-1666796400@qmi.miffanytark.com
SUMMARY:Experience the World’s Fastest Visible and Thermal Cameras
DESCRIPTION:Program\n12:00 PM: Seminar \n1:00 – 3:00 PM: Live Demos & Pizza \nLocation: Brimacombe 311 \nOverview\nThis showcase will provide an overview of High Speed & Thermal Imaging\, with an introduction to the factors that need to be considered for a successful set up and highlight latest advances. The presentation will discuss the different sensor architectures and how those impact the results. It will cover everything from 65.4 MP at 70 fps to 1 billion fps at 1MP visible cameras and thermal/infrared sensors. This will include the differences between CCD vs. CMOS vs. Thermal ROIC sensors and how these architectures affect the maximum frame rates and record times. New developments such as Correlated Double Sampling\, binning and Back Side Illuminated sensors for CMOS will be explained. RAM vs Solid State vs “On Sensor” high speed memory pros and cons will be described. Cutting edge cameras will be on hand\, so you can experience what is possible with the most recent technology. The presentation will be followed by a Q&A and live demos. \nSpeaker Bio\nNathaniel Kajumba has an MSci in Physics and a Ph.D. (2003-2007) in laser physics from Imperial College London and over 19 years of experience with lasers\, optics and research grade scientific instrumentation. He was a Research Associate at the National Research Council of Canada (NRC) from 2007-2010 in the Attosecond group of Paul Corkum\, and the Deputy Head of the Free Electron Laser Research Group at the Ludwig Maximilian University & Max-Plank Institute for Quantum Optics in Munich\, Germany (2010-2014). During this time he operated the ATLAS laser system in Munich\, Germany and the Gemini Laser Facility\, Rutherford Appleton Laboratory\, UK\, two of the worlds most powerful ultra fast lasers. On returning to Canada in 2014 he joined the team at Delta Photonics to leverage his experience to serve the Canadian Photonics community. Over the past eight years he has specialized in high-speed cameras and related technology. Nathaniel is located in the Vancouver sales office and covers western Canada.
URL:https://qmi.miffanytark.com/event/experience-the-worlds-fastest-visible-and-thermal-cameras/
CATEGORIES:Other seminars
ORGANIZER;CN="AMPEL":MAILTO:ampel-sec@apsc.ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221012T110000
DTEND;TZID=America/Vancouver:20221012T120000
DTSTAMP:20221011T171818Z
CREATED:20221011T171818Z
LAST-MODIFIED:20221011T171818Z
UID:4961-1665572400-1665576000@qmi.miffanytark.com
SUMMARY:R. Jason Jones: Frequency Comb Spectroscopy of Laser Produced Plasmas
DESCRIPTION:Professor R. Jason Jones – University of Arizona \nTitle: Frequency Comb Spectroscopy of Laser Produced Plasmas \nWhen: Wednesday\, October 12\, 2022 at 11am \nWhere: QMI 488 \nAbstract: In this talk I’ll give an overview of our work developing spectroscopic techniques with frequency comb sources from the XUV to the MIR. In particular\, I’ll focus on our work studying basic aspects of atomic\, ionic\, and molecular formation in laser-produced plasmas (LPP’s) using dual-comb spectroscopy. Our interest in such LPP’s includes their use in sample preparation for precision atomic/molecular spectroscopy and material analysis as well as surrogates for studying chemical/nuclear explosions and formation of heavy elements within kilonova. \nBio: Professor R. Jason Jones holds the John Paul Schaefer Endowed Chair in Optical Sciences at the University of Arizona. He leads a research group in experimental optical physics at the Wyant College of Optical Sciences. His research interests include ultrafast optics\, nonlinear light-matter interactions\, high-precision optical spectroscopy\, and the development and application of femtosecond frequency combs. Recent work focuses on novel architectures for optical atomic clocks and time-resolved dual-comb spectroscopy from the XUV to the MIR\, including the first demonstration of its use in studying atomic\, ionic\, and molecular formation inside laser-produced plasmas. Dr. Jones has also been instrumental in the establishment of the annual Winter School and Workshop at the Wyant College of Optical Sciences as a nation-wide event to introduce undergraduates to research and career opportunities in the field of Optics and Photonics. Dr. Jones received his PhD from the University of New Mexico in 2001. He continued his work as a research associate at JILA (a joint institute of the University of Colorado and the National Institute of Standards and Technology)\, where he was supported by a fellowship from the National Research Council\, working on the continued development and applications of fs frequency combs. In 2005 he demonstrated the up-conversion of frequency combs into the vacuum-ultraviolet for the first time. He continued to work as a Senior Research Associate of JILA until July 2006 when he left to join the College of Optical Sciences at the University of Arizona. He is a recipient of the NSF CAREER award and DARPA’s Young Investigator awards and is a member of the American Physical Society and the Optical Society of America. He holds two US patents and has published over 50 peer-reviewed articles.
URL:https://qmi.miffanytark.com/event/r-jason-jones-frequency-comb-spectroscopy-of-laser-produced-plasmas/
CATEGORIES:Other seminars
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20221004T120000
DTEND;TZID=America/Vancouver:20221004T130000
DTSTAMP:20221003T182524Z
CREATED:20221003T182524Z
LAST-MODIFIED:20221003T182524Z
UID:4947-1664884800-1664888400@qmi.miffanytark.com
SUMMARY:Dr. Sebastian Paeckel: Tensor network methods for open electron-phonon systems: Bipolarons in the presence of dissipation
DESCRIPTION:Dr. Sebastian Paeckel: Dr. Sebastian Paeckel is from LMU Germany and is one of the world leading experts in Tensor Network methods. \nTitle: Tensor network methods for open electron-phonon systems: Bipolarons in the presence of dissipation \nAbstract: Studying the interplay between electrons and phonons recently has seen a remarkable revival\, driven by both methodical progress\, as well as fascinating new physical insights\, such as the possibility of light-bipolaron induced superconductivity [1\,2] or the enhancement of transport properties [3]. Here\, investigating the effects of environments (dissipative\, thermal\, driven) coupled to the phonon system is a crucial but enormously challenging problem\, which on the one hand is important to understand the validity of effective\, isolated models\, while on the other hand allows for tailored manipulations of the phononic state. Recently\, we developed a new toolbox of tensor network methods which are designed to allow an efficient treatment of electron-phonon systems in- and out-of equilibrium as well as coupled to an environment. Exhibiting a speed-up of significantly more than an order of magnitude\, we are able to implement open quantum system techniques\, which previously had been way too expensive to be of proper use for studying large system sizes by means of tensor network methods.\nIn this talk I introduce the developed tools and give a brief overview of the current state\, their potential and limitations. Furthermore\, I discuss a first application\, namely the effect of a dissipative environment\, coupled to the Hubbard-Holstein model\, putting the emphasis on a previously reported enhancement of the metallic phase.\n[1]  Phys. Rev. Lett. 121\, 247001 (2021)\n[2]  https://doi.org/10.48550/arXiv.2203.07380\n[3] Scientific Reports volume 7\, 3774 (2017) \nShort Bio: Sebastian did his PhD in Göttingen from 2015-2019 focussing on the development Matrix Product States (MPS) methods\, in particular time evolution methods. In 2019 he had an internship at Microsoft Station Q iand studied transport through Majorana Islands. In 2020\, he became a Junior Researcher Leader in LMU in Munich and started studying electron phonon systems (method development and application\, also to quantum chemistry problems).
URL:https://qmi.miffanytark.com/event/dr-sebastian-paeckel-tensor-network-methods-for-open-electron-phonon-systems-bipolarons-in-the-presence-of-dissipation/
CATEGORIES:Other seminars
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