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X-WR-CALNAME:Stewart Blusson Quantum Matter Institute
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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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DTSTART;TZID=America/Vancouver:20211007T100000
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SUMMARY:CM Seminar - Benjamin Frandsen
DESCRIPTION:Talk title: From Quantum Magnets to Magnetic Thermoelectrics: Short-Range Spin Correlations and the Secrets They Keep \nSpeaker: Benjamin Frandsen\, Brigham Young University \nAbstract: Short-range magnetic correlations have been increasingly recognized in recent years for their importance in contexts as widely varied as geometrically frustrated magnetism and functional magnetocaloric materials. Neutron scattering provides experimental access to these short-range correlations through magnetic diffuse scattering\, but characterizing magnetic short-range order with quantitative accuracy has remained a difficult task. Here\, I introduce magnetic pair distribution function (mPDF) analysis as a powerful tool for the detailed elucidation of shortrange magnetic correlations by Fourier transforming the diffuse magnetic scattering into real space\, and I present the application of mPDF to two material systems for which the details of the short-range magnetic correlations are crucial for their unusual properties. The first is TmMgGaO4\, an Ising triangular lattice antiferromagnet with rich low-temperature behavior\, including a predicted topological Kosterlitz-Thouless transition. Our mPDF results reveal intricate spin correlations consistent with this theoretical prediction\, providing strong experimental support for the proposed Kosterlitz-Thouless phase. The second material is MnTe\, an antiferromagnetic semiconductor with excellent thermoelectric properties at elevated temperatures. The presence of short-range antiferromagnetic correlations above the Neel temperature contributes to the enhanced thermoelectric response. Using mPDF\, we reveal the real-space nature of these magnetic correlations and gain deeper insight into the origin of the unusually large thermopower of MnTe. \nBio: Ben Frandsen is an assistant professor in the Department of Physics and Astronomy at Brigham Young University in Utah. He earned his PhD in condensed matter physics at Columbia University in New York in 2016\, working with Professors Tomo Uemura and Simon Billinge on muon spin relaxation and x-ray and pair distribution function studies of strongly correlated electron systems. His graduate research took him to beautiful Vancouver many times to perform muon experiments at TRIUMF. Following his graduate work\, he joined the group of Bob Birgeneau at UC Berkeley in California as a postdoctoral researcher\, working primarily on experimental studies of iron-based superconductors. He joined the faculty at BYU in August 2018. His research at BYU is focused on investigating the local atomic and magnetic structure of complex materials using beams of x rays\, neutrons\, and muons. He was selected as a recipient of the U.S. Department of Energy Early Career Award in 2020 to study local atomic and magnetic structure in energy-relevant materials.
URL:https://qmi.miffanytark.com/event/cmseminar-benjamin-frandsen/
CATEGORIES:CM Seminar
ORGANIZER;CN="Kaho Saito":MAILTO:kaho.saito@ubc.ca
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20211014T100000
DTEND;TZID=America/Vancouver:20211014T110000
DTSTAMP:20211004T145423Z
CREATED:20211004T145423Z
LAST-MODIFIED:20211004T145423Z
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SUMMARY:CM Seminar - Andrew Potter
DESCRIPTION:https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09\nMeeting ID: 668 7999 5529\nPasscode: 113399 \n  \n\nAbstract: Quantum computation tantalizing promises efficient solutions to a broad range of classically-hard materials and chemistry simulation problems of interest to both basic science and practical applications. However\, nascent quantum processors are severely limited in both memory and accuracy\, and remain a long way from surpassing state-of-the-art classical computational methods. In this talk\, I will review recent progress in bridging this gap by leveraging efficient quantum data compression afforded by tensor network representations\, along with opportunistic midcircuit qubit reset and re-use in order to simulate large-scale models of quantum materials with relatively few qubits. I will highlight recent experimental implementations of quantum tensor network algorithms for simulating entangled ground-states and non-equilibrium dynamics of correlated spins and electrons on a trapped ion quantum processor. \n  \nBio: Andrew Potter is an assistant professor in the physics and astronomy department at UBC\, and SBQMI principle investigator\, working on theoretical problems at the intersection of quantum matter\, dynamics\, information\, and computing. Before joining UBC/SBQMI obtained his PhD from MIT\, was a Gordon and Betty Moore foundation postdoctoral fellow at UC Berkeley\, an assistant professor of physics at the University of Texas at Austin\, and a principle theoretical physicist at Honeywell | Quantum Solutions. \n  \nhttp://qmi.ubc.ca/news/new-investigator-meet-andrew-potter/
URL:https://qmi.miffanytark.com/event/andrew-potter-simulating-highly-entangled-matter-with-quantum-tensor-networks/
CATEGORIES:CM Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20211021T100000
DTEND;TZID=America/Vancouver:20211021T110000
DTSTAMP:20211014T184841Z
CREATED:20211014T184841Z
LAST-MODIFIED:20211014T184841Z
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SUMMARY:Vedika Khemani: Non-unitary dynamics via spacetime duality
DESCRIPTION:https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09\nMeeting ID: 668 7999 5529\nPasscode: 113399 \n  \n\nAbstract: The addition of non-unitary ingredients to many-body quantum dynamics has led to a series of exciting developments in recent years\, including new out-of-equilibrium entanglement phases and phase transitions enabled by quantum measurements. I will present recent work [1] in which we show that a duality transformation between space and time on one hand\, and unitarity and non-unitarity on the other\, can be used to realize non-unitary evolutions whose steady states exhibit a rich variety of behavior in the scaling of their entanglement with subsystem size — from logarithmic to extensive to fractal. These fractally entangled states add a qualitatively new entry to the families of many-body quantum states that have been studied as energy eigenstates or dynamical steady states\, whose entropy almost always displays either area-law\, volume-law or logarithmic scaling. The range of steady-state entanglement scalings for the non-unitary evolution are closely related to the question of entanglement growth in time under different kinds of unitary dynamics\, from localized to chaotic. This connection is sharpened by an exact mapping to unitary evolution with edge decoherence\, in which  information is irreversibly “radiated  away” from one edge of the system. Finally\, I will discuss how these ideas could be experimentally realized with present-day or near-term quantum technologies\, and how spacetime duality allows us to mitigate (or eliminate altogether) the overhead from “postselection” of random measurement outcomes [2]. \n  \n[1] Matteo Ippoliti\, Tibor Rakovszky\, Vedika Khemani\, arxiv:2103.06873\n[2] Matteo Ippoliti\, Vedika Khemani\, PRL 126\, 060501 (2021) \n  \nBio: Vedika Khemani is an assistant professor of physics at Stanford University. After completing her Ph.D. at Princeton University in 2016\, she did her postdoctoral work as a Junior Fellow at Harvard. She is a recipient of an Alfred P. Sloan Fellowship\, a DOE Early Career Award\, the William L. McMillan Award\, an APS George E. Valley Jr. Prize\, the Breakthrough New Horizons in Physics Prize and the Packard Fellowship in Science and Engineering. \n 
URL:https://qmi.miffanytark.com/event/vedika-khemani-non-unitary-dynamics-via-spacetime-duality/
CATEGORIES:CM Seminar
ORGANIZER;CN="Kaho Saito":MAILTO:kaho.saito@ubc.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20211028T100000
DTEND;TZID=America/Vancouver:20211028T230000
DTSTAMP:20211019T145814Z
CREATED:20211019T145814Z
LAST-MODIFIED:20211019T145814Z
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SUMMARY:Shanti Deemyad: Physics of Light Dense Matter: Quantum and Classical Effects in Dense lithium
DESCRIPTION:https://ubc.zoom.us/j/66879995529?pwd=dHpQb25LSGVZK3ozY243em5tenRWQT09\nMeeting ID: 668 7999 5529\nPasscode: 113399 \n  \n\nSpeaker: Prof. Shanti Deemyad\, University of Utah \n  \nRestricting the volume of a material\, through application of pressure\, changes the dominance of interactions within the material\, and exposes unnatural states of matter not found in our predominantly adiabatic universe.  One of the most exotic phenomena in condensed matter is the phase transitions purely driven by quantum effects. While quantum fluctuations in electronic states are always relevant\, it is also possible to observe quantum effects in lattice of very light elements. At ambient conditions\, the lightest metal of the periodic system is lithium. Similar to hydrogen and helium even at zero temperature lattice of lithium remains far from static and a fascinating system to explore the lattice quantum effects in light dense matter. \nIn this talk I will review some of the major goals of research in high pressure physics in exploring the quantum effects in ultra-light dense matter and discuss how nuclear quantum effects affect the structural stability and superconductivity of lithium and other ultra-light materials. I will present our studies on exploring the signature of lattice quantum contributions to the structural phase transitions of lithium at low temperature\, the effect of pressure on the evolution of Fermi surface of lithium and present our results on resolving the long-lasting mystery of lithium ground state. \n 
URL:https://qmi.miffanytark.com/event/shanti-deemyad-physics-of-light-dense-matter-quantum-and-classical-effects-in-dense-lithium/
CATEGORIES:CM Seminar
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