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IQIM Postdoctoral and Graduate Student Seminar

Friday, April 23, 2021
11:00am to 12:00pm
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Prethermalization and dynamics in topological SYK pumps
Iliya Esin, Postdoctoral Scholar, Refael Group,

Abstract: We investigate the dynamics of a periodically driven strongly interacting system described by a model of a multi-orbital non-adiabatic topological Thouless pump. Fermions occupying different orbitals can locally interact through random interactions, realizing a copy of a charged Sachdev-Ye-Kitaev (SYK) dot at each site. While each single SYK dot is maximally chaotic and is known as an effective thermalizer, we found that a periodically driven chain of such dots exhibits a regime in which the thermalization is exponentially slow, giving rise to a quasi-steady state. In this quasi-steady state, fermions uniformly occupy single-particle states in one of the chiral Floquet bands, resulting in a universal value of the pumped charge per cycle even in a partially filled system. Our work may help guide future studies of dynamical phases in strongly coupled materials, such as high-temperature superconductors and moiré materials under non-equilibrium conditions.

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For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at marciab@caltech.edu.