Signatures of many-body localization in steady states of open quantum systems

作     者：I. Vakulchyk I. Yusipov M. Ivanchenko S. Flach S. Denisov 

作者机构：Center for Theoretical Physics of Complex Systems IBS Daejeon 34051 Republic of Korea Basic Science Program Korea University of Science and Technology (UST) Daejeon 34113 Republic of Korea Department of Applied Mathematics Lobachevsky University Nizhny Novgorod 603950 Russia Institute of Physics University of Augsburg Universitätsstraße 1 86159 Augsburg Germany 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2018年第98卷第2期

页      面：020202(R)-020202(R)页

核心收录：

基　　金：Korea Basic Science Institute, KBSI, (IBS-R024-D1) Russian Science Foundation, RSF, (15-12-20029) 

主　　题：Many-body localization Open quantum systems 

摘      要：Many-body localization (MBL) is a result of the balance between interference-based Anderson localization and many-body interactions in a high-dimensional Fock space. It is expected that dissipation is blurring interference and destroying that balance so that the asymptotic state of a system with an MBL Hamiltonian does not bear localization signatures. This is evidently true in the case of local dephasing which drives any system into an infinite-temperature state. We demonstrate, by using a set of dissipative operators, where each one is acting nontrivially on a pair of neighboring sites (or spins), that an MBL system can be brought into a Hamiltonian-specific steady state. The difference between ergodic and MBL Hamiltonians can be seen in statistics of imbalance, entanglement entropy, and level spacing of the steady-state density operator. By introducing pairwise dissipative operators into an MBL system already exposed to dephasing, these localization signatures can be restored.