Signatures of many-body localization and metastability by weak perturbation
Abstract
Nonequilibrium dynamics in isolated quantum many-body systems displays a number of intriguing features, such as many-body localization (MBL) and prethermalization. Here we investigate a simple ladder system with disorder, in which various distinct dynamical features coexist and interplay. By exact diagonalization, we demonstrate that the system exhibits the signatures of an MBL-ergodic-MBL reentrant transition, metastability, and disorder-free MBL. We give an account of these properties by introducing a quasi-particle picture and interpreting the quasi-vacuum energy fluctuation as an effective disorder on the quasi-particle dynamics. It is speculated that the weak perturbation behavior is a finite-size effect, but its relaxation time scale increases with the system size.
Keywords
Cite
@article{arxiv.1906.12020,
title = {Signatures of many-body localization and metastability by weak perturbation},
author = {Yang Zhao and Rajesh Narayanan and Jaeyoon Cho},
journal= {arXiv preprint arXiv:1906.12020},
year = {2020}
}