Group Seminar at LMU: Random multipolar driving: tunably slow heating through spectral engineering

May 30, 2023

Hongzheng Zhao, MPIPKS Dresden
Group Seminar at LMU seminar room
Tuesday, May 30th, 9:00am (MEZ)


Driven quantum systems may realize novel phenomena absent in static systems, but driving-induced heating can limit the timescale on which these persist. We study heating in interacting quantum many-body systems driven by random sequences with n-multipolar correlations, corresponding to a polynomially suppressed low-frequency spectrum [1]. For n≥1, we find a prethermal regime, the lifetime of which grows algebraically with the driving rate, with exponent 2n+1. A simple theory based on Fermi’s golden rule accounts for this behaviour. I will discuss its potential realisation in optical lattices and address the driving-induced particle excitation to higher bands which commonly occurs in experiments [2]. These higher bands effects turn to be controllable even away from a high-frequency driving regime. This opens a window for observing driving-induced phenomena in a long-lived prethermal regime in the lowest band.

[1] Phys. Rev. Lett. 126, 040601
[2] Phys. Rev. Lett. 129, 120605

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