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Ihor Vakulchyk
복잡계 이론물리 연구단
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Signatures of many-body localization in steady states of open quantum systems

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Title
Signatures of many-body localization in steady states of open quantum systems
Author(s)
I. Vakulchyk; I. Yusipov; M. Ivanchenko; S. Flach; S. Denisov
Publication Date
2018-07
Journal
PHYSICAL REVIEW B, v.98, no.2, pp.020202 -
Publisher
AMER PHYSICAL SOC
Abstract
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. ©2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/4957
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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