Nonequilibrium quantum dynamics and chiral Bloch oscillation in an interacting two-leg ladder induced by defect perturbations

Abstract

The nonequilibrium quantum dynamics and nonlinear chiral Bloch oscillation in interacting flux ladder induced by arbitrarily distributed defects are studied analytically and numerically. Under a time-dependent two-mode approximation, the system with arbitrarily distributed defects can be deduced to the case with single defect and the dynamical behavior of the system can be predicted analytically. The nontrivial competition between the atomic interaction and defects causes the system to undergo a dynamical quantum phase transition (DQPT) which can be identified by the chiral Bloch oscillation induced by the defects. Importantly, the DQPT is not only related to the underlying ground state of the system but also to the properties of the defects. The DQPT can be well modulated by different types of defects. This work provides a feasible theoretical scheme for the experimental design and operation of DQPT by defect perturbations.