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arXiv 1407.4476cond-mat.str-elcond-mat.dis-nncond-mat.stat-mech
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量子复活与多体局域化

Quantum revivals and many-body localization

R. Vasseur, S. A. Parameswaran, J. E. Moore

摘要:

我们表明,一个单一的“量子位”自旋弱耦合到一个孤立的无序自旋链的磁化表现出定期复苏的本地化制度,并保留其初始磁化的印记在无限的时间。我们表明,复苏率强烈抑制后,添加相互作用的时间尺度对应的失相,区分多体本地化阶段从安德森绝缘体的发病。相比之下,遍历阶段充当量子位的浴,在研究的时间尺度上没有可见的复兴。抑制量子复苏的本地观测提供了一个定量的,实验上可观察到的替代纠缠增长作为衡量的“非遍历,但退相”性质的多体本地化系统。

英文摘要:

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 `non-ergodic but dephasing' nature of many-body localized systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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