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arXiv 1706.09338cond-mat.dis-nncond-mat.stat-mech
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作为量子雪崩的多体离域

Many-body delocalization as a quantum avalanche

Thimothée Thiery, François Huveneers, Markus Müller, Wojciech De Roeck

摘要:

我们提出了一个多尺度对角化方案来研究无序一维链,特别是多体局域化(MBL)和遍历相之间的过渡,预计将由共振点。我们的方案侧重于二分法MBL与{ETH}(本征态热化假设)。我们表明,一些自然的假设意味着该系统是本地化的概率在临界状态。在各态历经方面,离域是由大的各态历经点,其大小在过渡发散种子量子雪崩诱导。在MBL侧,典型的本地化长度往往是一个有限的普遍值的过渡,但有一个发散的长度尺度相关的响应包含大遍历点。平均场近似分析说明了这些结果,并预测为幂律分布的热夹杂物在临界状态。

英文摘要:

We propose a multi-scale diagonalization scheme to study disordered one-dimensional chains, in particular the transition between many-body localization (MBL) and the ergodic phase, expected to be governed by resonant spots. Our scheme focuses on the dichotomy MBL versus {ETH} (eigenstate thermalization hypothesis). We show that a few natural assumptions imply that the system is localized with probability one at criticality. On the ergodic side, delocalization is induced by a quantum avalanche seeded by large ergodic spots, whose size diverges at the transition. On the MBL side, the typical localization length tends to a finite universal value at the transition, but there is a divergent length scale related to the response to an inclusion of large ergodic spots. A mean field approximation analytically illustrates these results and predicts as a power-law distribution for thermal inclusions at criticality.

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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