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arXiv 1606.07590cond-mat.dis-nn
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多体局域化跃迁的有限尺寸标度:单个本征态的有限尺寸伪临界点

Finite size scaling for the Many-Body-Localization Transition : finite-size-pseudo-critical points of individual eigenstates

Cecile Monthus

摘要:

为了理解存在淬火无序的经典和量子模型中相变的有限尺寸标度性质,在每个无序样品中引入有限尺寸伪临界点的概念并分析其作为尺寸的函数的样品到样品的涨落已被证明是富有成效的。对于多体局域化跃迁,在给定的能量密度下,甚至在给定的无序样品中也有很强的本征态到本征态的涨落[X. Yu,黑腹叶蝉D. J. Luitz,B. K. Clark,arxiv:1606.01260和V.Khemani,S. P. Lim,D. N. Sheng,L.等,中国茶盲蝽D. A. Huse,arxiv:1607.05756],因此,引入每个本征态的有限大小伪临界点的概念并研究由相关长度指数$ν$控制的本征态到本征态的波动似乎是有用的。临界本征态的标度特性也有望出现得更清楚,如果一个认为每个本征态在其有限大小的伪临界点,在那里它是“真正的关键”,而标准的平均本征态和样品在临界区域实际上看到一个混合的状态,有效地要么本地化或离域。

英文摘要:

To understand the finite-size-scaling properties of phases transitions in classical and quantum models in the presence of quenched disorder, it has proven to be fruitful to introduce the notion of a finite-size-pseudo-critical point in each disordered sample and to analyze its sample-to-sample fluctuations as a function of the size. For the Many-Body-Localization transition, where very strong eigenstate-to-eigenstate fluctuations have been numerically reported even within a given disordered sample at a given energy density [X. Yu, D. J. Luitz, B. K. Clark, arxiv:1606.01260 and V. Khemani, S. P. Lim, D. N. Sheng, D. A. Huse,arxiv:1607.05756], it seems thus useful to introduce the notion of a finite-size-pseudo-critical point for each individual eigenstate and to study its eigenstate-to-eigenstate fluctuations governed by the correlation length exponent $ν$. The scaling properties of critical eigenstates are also expected to appear much more clearly if one considers each eigenstate at its finite-size-pseudo-critical point, where it is 'truly critical', while standard averages over eigenstates and samples in the critical region actually see a mixture of states that are effectively either localized or delocalized.

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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