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arXiv 1407.7535cond-mat.dis-nncond-mat.str-el
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一维无序晶格上无自旋费米子相互作用系统中的无扩散

Absence of diffusion in an interacting system of spinless fermions on a one-dimensional disordered lattice

Yevgeny Bar Lev, Guy Cohen, David R. Reichman

摘要:

我们研究了一个期望表现出多体局域化的一维原型系统的无限温度动力学。利用数值精确方法,根据系统特征值的统计和动力学行为,建立了系统的动力学相图。我们发现,非遍历相是重入的相互作用强度的函数,说明本地化可以加强足够的强相互作用,即使在无限的温度。令人惊讶的是,在可访问的时间范围内,各态历经相显示subdiffusive行为,表明扩散系数消失在整个大部分的相图中的热力学极限。我们的研究结果强烈表明,Wigner-Dyson统计的特征值间距可能会出现在一类遍历,但亚扩散系统。

英文摘要:

We study the infinite temperature dynamics of a prototypical one-dimensional system expected to exhibit many-body localization. Using numerically exact methods, we establish the dynamical phase diagram of this system based on the statistics of its eigenvalues and its dynamical behavior. We show that the nonergodic phase is reentrant as a function of the interaction strength, illustrating that localization can be reinforced by sufficiently strong interactions even at infinite temperature. Surprisingly, within the accessible time range, the ergodic phase shows subdiffusive behavior, suggesting that the diffusion coefficient vanishes throughout much of the phase diagram in the thermodynamic limit. Our findings strongly suggest that Wigner-Dyson statistics of eigenvalue spacings may appear in a class of ergodic but subdiffusive systems.

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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