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Maximal quantum chaos of the critical Fermi surface

January 28, 2022 @ 2:30 pm - 4:00 pm


Speaker: Maria Tikhanovskaya (Harvard)

Title: Maximal quantum chaos of the critical Fermi surface

Abstract: 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.


January 28, 2022
2:30 pm - 4:00 pm
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