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arXiv 2203.06198cond-mat.dis-nncond-mat.mes-hallcond-mat.stat-mech
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二维格点规范理论中的无无序局域化跃迁

Disorder-free localization transition in a two-dimensional lattice gauge theory

Nilotpal Chakraborty, Markus Heyl, Petr Karpov, Roderich Moessner

摘要:

无无序局域化是在相互作用量子多体系统如格点规范理论(LGT)中出现的一种新的遍历性破缺机制。虽然传统的多体局域化的量子局域化跃迁(QLT)的性质仍然存在争议,在这里,我们提供了第一个全面的表征QLT在二维(2D)的无序的情况下。无无序局域化可以出现在均匀的2D LGT中,例如U(1)量子链接模型(QLM),这是由于潜在的经典渗流跃迁将系统分裂成不连通的实空间簇。基于渗流模型,我们通过对有限尺寸实空间团簇的遍历性质的详细研究,利用能级间距统计和组态空间局域化,刻画了U(1)QLM中的QLT.我们认为存在两个制度-一个是大的有限大小的集群有效地表现非遍历,结果自然占配置空间中的干扰现象,另一个是所有大型集群遍历行为。作为一个中心的结果,在后一个政权,我们声称,QLT是等价的经典渗流过渡,因此是连续的。利用这种等价性,我们通过对渗透问题的有限尺寸标度分析来确定QLT的普适类和临界行为。

英文摘要:

Disorder-free localization is a novel mechanism for ergodicity breaking which can occur in interacting quantum many-body systems such as lattice gauge theories (LGTs). While the nature of the quantum localization transition (QLT) is still debated for conventional many-body localization, here we provide the first comprehensive characterization of the QLT in two dimensions (2D) for a disorder-free case. Disorder-free localization can appear in homogeneous 2D LGTs such as the U(1) quantum link model (QLM) due to an underlying classical percolation transition fragmenting the system into disconnected real-space clusters. Building on the percolation model, we characterize the QLT in the U(1) QLM through a detailed study of the ergodicity properties of finite-size real-space clusters via level-spacing statistics and localization in configuration space. We argue for the presence of two regimes - one in which large finite-size clusters effectively behave non-ergodically, a result naturally accounted for as an interference phenomenon in configuration space and the other in which all large clusters behave ergodically. As one central result, in the latter regime we claim that the QLT is equivalent to the classical percolation transition and is hence continuous. Utilizing this equivalence we determine the universality class and critical behaviour of the QLT from a finite-size scaling analysis of the percolation problem.

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