Quantum revivals and many-body localization

被引：98

作者：

Vasseur, R. ^{[1
,2
]}

Parameswaran, S. A. ^{[3
]}

Moore, J. E. ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 14期

基金：

美国国家科学基金会;

关键词：

ANDERSON LOCALIZATION; THERMALIZATION; TRANSPORT;

D O I：

10.1103/PhysRevB.91.140202

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We show that the magnetization of a single "qubit" spin weakly coupled to an otherwise isolated disordered spin chain exhibits periodic revivals in the localized regime, and retains an imprint of its initial magnetization at infinite time. We demonstrate that the revival rate is strongly suppressed upon adding interactions after a time scale corresponding to the onset of the dephasing that distinguishes many-body localized phases from Anderson insulators. In contrast, the ergodic phase acts as a bath for the qubit, with no revivals visible on the time scales studied. The suppression of quantum revivals of local observables provides a quantitative, experimentally observable alternative to entanglement growth as a measure of the "nonergodic but dephasing" nature of many-body localized systems.

引用

页数：5

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