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arXiv 2102.02824cond-mat.dis-nncond-mat.stat-mech
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多体局域化相变的多重分形和自平均

Multifractality and self-averaging at the many-body localization transition

Andrei Solórzano, Lea F. Santos, E. Jonathan Torres-Herrera

摘要:

在多体局域化的研究中,电子尺度效应一直是一个主要的和合理的关注点,并且已经有一些工作致力于这个主题。然而,在本文中,我们讨论的另一个关键问题,已收到少得多的关注,即缺乏自平均和随之而来的危险,减少随机实现的数量作为系统大小的增加。考虑到这一点,并考虑与大量的样本分析的所有系统尺寸的系综,我们发现,无序的海森堡自旋-1/2链的本征态的广义尺寸接近的过渡点,本地化的非相互作用的Fibonacci晶格导出的精确的解析表达式描述非常好,从而提供了一个额外的工具,研究多体局域化。

英文摘要:

Finite-size effects have been a major and justifiable source of concern for studies of many-body localization, and several works have been dedicated to the subject. In this paper, however, we discuss yet another crucial problem that has received much less attention, that of the lack of self-averaging and the consequent danger of reducing the number of random realizations as the system size increases. By taking this into account and considering ensembles with a large number of samples for all system sizes analyzed, we find that the generalized dimensions of the eigenstates of the disordered Heisenberg spin-1/2 chain close to the transition point to localization are described remarkably well by an exact analytical expression derived for the non-interacting Fibonacci lattice, thus providing an additional tool for studies of many-body localization.

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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