Many-body dynamical phase transition in a quasiperiodic potential

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 quasiperiodic potential, which induces delocalization-localization transition even in one dimension. 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 nonanalyticity 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 nonanalyticities in the many-body dynamical free energy.