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DTSTART;TZID=America/New_York:20220118T143000
DTEND;TZID=America/New_York:20220118T160000
DTSTAMP:20260628T173439
CREATED:20240214T092207Z
LAST-MODIFIED:20240301T075905Z
UID:10002620-1642516200-1642521600@cmsa.fas.harvard.edu
SUMMARY:Metals with strongly correlated electrons: quantum criticality\, disordered interactions\, Planckian dissipation\, and scale invariance
DESCRIPTION:Speaker: Aavishkar Patel (UC Berkeley) \nTitle: Metals with strongly correlated electrons: quantum criticality\, disordered interactions\, Planckian dissipation\, and scale invariance \nAbstract: Metals that do not fit Landau’s famous Fermi liquid paradigm of quasiparticles are plentiful in experiments\, but constructing their theoretical description is a major challenge in modern quantum many-body physics. I will describe new models that can systematically describe such non-Fermi liquid metals at quantum critical points\, and that allow for the accurate computation of a whole host of experimentally measurable static and dynamic quantities despite the presence of both strong correlations and disorder. I will further demonstrate that disorder coupling to interaction operators can lead to the experimentally observed linear-in-temperature (T-linear) resistivity seen at metallic quantum critical points\, and can also generate the observed universal “Planckian” transport scattering rate of kBT/ℏ. Finally\, I will show that “perfect” T-linear resistivity is associated with an energy invariant quantity defined in the many-body microcanonical ensemble\, which motivates the existence of a deep connection between the T-linear resistivity seen at high temperatures and low temperatures with the same slope in many quantum critical materials.
URL:https://cmsa.fas.harvard.edu/event/1-18-2022-quantum-matter-in-mathematics-and-physics/
LOCATION:MA
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/jpeg:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-1.18.22-1544x2048-1.jpg
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DTSTART;TZID=America/New_York:20220128T143000
DTEND;TZID=America/New_York:20220128T160000
DTSTAMP:20260628T173439
CREATED:20240214T111332Z
LAST-MODIFIED:20240301T074750Z
UID:10002692-1643380200-1643385600@cmsa.fas.harvard.edu
SUMMARY:Maximal quantum chaos of the critical Fermi surface
DESCRIPTION:Speaker: Maria Tikhanovskaya (Harvard) \nTitle: Maximal quantum chaos of the critical Fermi surface \nAbstract: In this talk\, I will describe many-body quantum chaos in a recently proposed large-N theory for critical Fermi surfaces in two spatial dimensions\, by computing out-of-time-order correlation functions. I will use the ladder identity proposed by Gu and Kitaev\, and show that the chaos Lyapunov exponent in this system takes on the maximum possible value of 2πkBT/ℏ\, where T is the absolute temperature. In addition\, by varying the dynamic critical exponent\, I will show that the maximal chaos persists only in the regime where quasiparticles are absent. When quasiparticles are present\, the Lyapunov exponent scales with the temperature as ~ T^a\, where a < 1\, which is parametrically smaller than the maximal rate.
URL:https://cmsa.fas.harvard.edu/event/1-28-2022-quantum-matter-in-mathematics-and-physics/
LOCATION:MA
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/jpeg:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-1.28.2022-1544x2048-1.jpg
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