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arXiv 1903.05099cond-mat.dis-nncond-mat.quant-gascond-mat.stat-mech
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关联和非关联无序下长程跳跃模型中的多体动力学

Many-body dynamics in long-range hopping model in the presence of correlated and uncorrelated disorder

Ranjan Modak, Tanay Nag

摘要:

关于安德森局域化的纠缠熵和参与比的普适性质,人们已经有了很多的了解。我们发现一个新的子广泛的缩放与系统大小的上述措施的代数本地化注意到在一维长程跳跃模型中存在的不相关的障碍。虽然EE的标度指数似乎普遍随单粒子态(SPS)的长程局域化指数而变化,但PR并不显示这样的大学,因为它也取决于SPS的短程关联。另一方面,在相关的障碍的存在下,两种SPS(遍历离域和非遍历多重分形或本地化)的混合物被观察到,这导致广泛(次广泛)缩放EE(PR)。考虑典型的多体本征态,我们得到了上述结果,并与渐近动力学得到了进一步的证实。此外,只有在相关的情况下,EE的有限时间的次级缓慢增长,而对于不相关的情况下,只有初级增长,然后饱和。我们相信,即使在弱相互作用极限下,我们对典型多体本征态的研究结果也不会改变。

英文摘要:

Much have been learned about universal properties of entanglement entropy (EE) and participation ration (PR) for Anderson localization. We find a new sub-extensive scaling with system size of the above measures for algebraic localization as noticed in one-dimensional long-range hopping models in the presence of uncorrelated disorder. While the scaling exponent of EE seems to vary universally with the long distance localization exponent of single particle states (SPSs), PR does not show such university as it also depends on the short range correlations of SPSs. On the other hand, in presence of correlated disorder, an admixture of two species of SPSs (ergodic delocalized and non-ergodic multifractal or localized) are observed, which leads to extensive (sub-extensive) scaling of EE (PR). Considering typical many-body eigenstates, we obtain above results that are further corroborated with the asymptotic dynamics. Additionally, a finite time secondary slow growth in EE is witnessed only for correlated case while for uncorrelated case there exists only primary growth followed by the saturation. We believe that our findings from typical many-body eigenstate would remain unaltered even in the weakly interacting limit.

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