Many-body dynamical phase transition in quasi-periodic potential

TL;DR

This paper investigates many-body dynamical phase transitions in one-dimensional fermionic systems with quasi-periodic potentials, revealing how localization-delocalization transitions influence non-analyticities in dynamical free energy and their relation to entanglement growth.

Contribution

It demonstrates the occurrence of DQPT across localization transitions in quasi-periodic systems and explores the impact of filling fractions and interactions on these phenomena.

Findings

DQPT signatures appear when quenching between different universality classes.

Faster entanglement growth correlates with quicker DQPT manifestation.

Dynamical free energy non-analyticities depend on filling fractions and interactions.

Abstract

Much has been learned regarding dynamical quantum phase transition (DQPT) due to sudden quenches across quantum critical points in traditional quantum systems. However, not much has been explored when a system undergoes a localization-delocalization transition. Here, we study one dimensional fermionic systems in presence of a quasi-periodic potential, which induces delocalization-localization transition even in 1D. We show signatures of DQPT in the many-body dynamics, when quenching is performed between phases belonging to different universality classes. We investigate how the non-analyticity in the dynamical free energy gets affected with filling fractions in the bare system and, further, study the fate of DQPT under interaction. Strikingly, whenever quenching is performed from the low-entangled localized phase to the high-entangled delocalized phase, our studies suggest an intimate relationship between DQPT and the rate of the entanglement growth -- Faster growths of entanglement entropy ensures quicker manifestation of the non-analiticties in the many-body dynamical free energy.