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arXiv 1403.7817cond-mat.stat-mechcond-mat.str-el
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Bethe格点上的安德森局域化:扩展态的非遍历性

Anderson localization on the Bethe lattice: non-ergodicity of extended states

A. De Luca, B. L. Altshuler, V. E. Kravtsov, A. Scardicchio

摘要:

统计分析的安德森紧束缚模型的本征函数与现场无序规则随机图强烈表明,扩展状态是多重分形在任何有限的混乱。在方程中定义的分形维数$f(α)$的谱。(3)即使当无序比导致安德森局域化的无序弱几倍时,即遍历性仅在没有无序的情况下才能达到时,仍然对$α$显著地远离1保持阳性。贝特晶格上的单粒子多重分形表明,只要一般的多体量子系统保持孤立,均分定律就可能不适用于它。

英文摘要:

Statistical analysis of the eigenfunctions of the Anderson tight-binding model with on-site disorder on regular random graphs strongly suggests that the extended states are multifractal at any finite disorder. The spectrum of fractal dimensions $f(α)$ defined in Eq.(3), remains positive for $α$ noticeably far from 1 even when the disorder is several times weaker than the one which leads to the Anderson localization, i.e. the ergodicity can be reached only in the absence of disorder. The one-particle multifractality on the Bethe lattice signals on a possible inapplicability of the equipartition law to a generic many-body quantum system as long as it remains isolated.

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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