Dynamical many-body delocalization transition of a Tonks gas in a quasi-periodic driving potential

TL;DR

This paper investigates how a Tonks gas subjected to a quasi-periodic driving potential undergoes a dynamical many-body delocalization transition, revealing distinct localized and delocalized phases with unique scaling behaviors.

Contribution

It introduces the study of many-body localization transition in a driven Tonks gas under quasi-periodic driving, extending understanding beyond non-interacting systems.

Findings

Localized phase described by low effective temperature

Delocalized phase reaches infinite temperature with linear time increase

Critical point shows breakdown of one-parameter scaling theory

Abstract

The quantum kicked rotor is well-known for displaying dynamical (Anderson) localization. It has recently been shown that a periodically kicked Tonks gas will always localize and converge to a finite energy steady-state. This steady-state has been described as being effectively thermal with an effective temperature that depends on the parameters of the kick. Here we study a generalization to a quasi-periodic driving with three frequencies which, without interactions, has a metal-insulator Anderson transition. We show that a quasi-periodically kicked Tonks gas goes through a dynamical many-body delocalization transition when the kick strength is increased. The localized phase is still described by a low effective temperature, while the delocalized phase corresponds to an infinite-temperature phase, with the temperature increasing linearly in time. At the critical point, the momentum distribution of the Tonks gas displays different scaling at small and large momenta (contrary to the non-interacting case), signaling a breakdown of the one-parameter scaling theory of localization.