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arXiv 2008.02285cond-mat.str-elcond-mat.dis-nncond-mat.stat-mechquant-ph
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拓扑和随机量子临界点

Topological and symmetry-enriched random quantum critical points

Carlos M. Duque, Hong-Ye Hu, Yi-Zhuang You, Vedika Khemani, Ruben Verresen, Romain Vasseur

摘要:

我们研究了对称性如何丰富强随机性量子临界点和相位,并导致鲁棒的拓扑边缘模式共存的临界体涨落。这些是无间隙拓扑相的无序类似物。利用实空间方法和密度矩阵重整化群方法,我们分析了这种富氢无规量子自旋链的边界和体临界行为。我们发现了一类新的非线性丰富的无限随机不动点:而本地散装性能是无法区分的传统的随机单态相,非本地的可观性和边界临界行为的控制不同的重整化群不动点。我们还说明了如何在Floquet系统中自然出现这样的新的量子临界点。

英文摘要:

We study how symmetry can enrich strong-randomness quantum critical points and phases, and lead to robust topological edge modes coexisting with critical bulk fluctuations. These are the disordered analogues of gapless topological phases. Using real-space and density matrix renormalization group approaches, we analyze the boundary and bulk critical behavior of such symmetry-enriched random quantum spin chains. We uncover a new class of symmetry-enriched infinite randomness fixed points: while local bulk properties are indistinguishable from conventional random singlet phases, nonlocal observables and boundary critical behavior are controlled by a different renormalization group fixed point. We also illustrate how such new quantum critical points emerge naturally in Floquet 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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