arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.07910cond-mat.dis-nncond-mat.mes-hall
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分格上A类系统强无序的反常Hall金属

Anomalous Hall metals from strong disorder in class A systems on partite lattices

Eduardo V. Castro, Raphael de Gail, M. Pilar López-Sancho, María A. H. Vozmediano

摘要:

拓扑物质是凝聚态中的一个热门话题:从基本的角度来看,它引入了新的现象和工具,对于技术应用,它有望实现基本稳定的量子计算。类似地,无序定域物理学,一个在该领域具有明显技术重要性的旧范式,当物质的新性质出现时,继续揭示惊喜。这项工作涉及的局部化行为的电子系统的基础上,特别注意的作用,拓扑结构的分格。我们发现一个意想不到的结果,从局部化性质的角度来看:一个强大的拓扑金属状态,其特征在于非量子化的霍尔电导率产生强无序的A类(时间反演对称性破缺)绝缘体。关键问题是无序实现的性质:基于二分格的系统中只有一个子格的选择性无序。结果的一般性是基于最新的2D材料如石墨烯或过渡金属二硫属化物的分裂性质,以及在参考文献1中证明的特定无序的物理实现的可能性。当原始的干净绝缘体在拓扑上是平凡的时,也会出现反常的霍尔金属。

英文摘要:

Topological matter is a trending topic in condensed matter: From a fundamental point of view it has introduced new phenomena and tools, and for technological applications, it holds the promise of basic stable quantum computing. Similarly, the physics of localization by disorder, an old paradigm of obvious technological importance in the field, continues revealing surprises when new properties of matter appear. This work deals with the localization behavior of electronic systems based on partite lattices with special attention to the role of topology. We find an unexpected result from the point of view of localization properties: A robust topological metallic state characterized by a non--quantized Hall conductivity arises from strong disorder in class A (time reversal symmetry broken) insulators. The key issue is the nature of the disorder realization: selective disorder in only one sublattice in systems based on bipartite lattices. The generality of the result is based on the partite nature of most recent 2D materials as graphene or transition metal dichalcogenides, and the possibility of the physical realization of the particular disorder demonstrated in ref. 1. An anomalous Hall metal arises also when the original clean insulator is topologically trivial.

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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