arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1608.03586cond-mat.dis-nncond-mat.stat-mechcond-mat.str-el
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用无序关联表征多体局域化

Characterizing Many-Body Localization by Out-of-Time-Ordered Correlation

Rong-Qiang He, Zhong-Yi Lu

摘要:

无序关联是量化量子混沌性的一个重要参量,近年来已被用于量子全息的研究。在这里,我们使用它来研究和表征多体局域化(MBL)。我们发现,一个长时间的对数变化的OTO相关性发生在MBL阶段,但在安德森本地化和遍历阶段缺席。我们提取的MBL阶段的本地化长度,这取决于相互作用和发散在一个关键的相互作用。此外,OTO关联的无限时间“热”涨落在各态历经(MBL)相中为零(有限),因此可以被认为是各态历经-MBL跃迁的序参量,通过它可以识别和表征跃迁。具体地,可以计算临界点和相关的临界指数。

英文摘要:

The out-of-time-ordered (OTO) correlation is a key quantity for quantifying quantum chaoticity and has been recently used in the investigation of quantum holography. Here we use it to study and characterize many-body localization (MBL). We find that a long-time logarithmic variation of the OTO correlation occurs in the MBL phase but is absent in the Anderson localized and ergodic phases. We extract a localization length in the MBL phase, which depends logarithmically on interaction and diverges at a critical interaction. Furthermore, the infinite-time `thermal' fluctuation of the OTO correlation is zero (finite) in the ergodic (MBL) phase and thus can be considered as an order parameter for the ergodic-MBL transition, through which the transition can be identified and characterized. Specifically, the critical point and the related critical exponents can be calculated.

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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