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arXiv 2407.20296cond-mat.mes-hallcond-mat.mtrl-sci
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拓扑非厄米棋盘格晶格中的霍尔输运

Hall transport in the topological non-Hermitian checkerboard lattice

P. G. de Oliveira, A. S. T. Pires

AI总结:

本文研究了拓扑非厄米棋盘格晶格的霍尔输运,发现非厄米性使霍尔电导率不再量子化,为凝聚态开放系统拓扑提供启示。

摘要:

棋盘格晶格是一种二维非平庸结构,通常被视为烧绿石晶格的平面版本。该几何结构支持由复数跃迁参数诱导的具有Chern拓扑的双能带绝缘电子系统。受非厄米系统拓扑最新进展的启发,本文研究了拓扑棋盘格晶格的非厄米版本。计算了复能带结构和Berry曲率。在绝缘相中,Chern数与厄米版本相同,但霍尔电导率不再量子化。研究了霍尔电导率对非厄米参数的依赖关系。非厄米性可视为系统与环境耦合引起的耗散结果,因此本研究为凝聚态物理中开放系统的拓扑提供了启示。

英文摘要:

The checkerboard lattice is a two-dimensional non-trivial structure usually seen as a planar version of the pyrochlore lattice. This geometry supports a two-band insulating electronic system with Chern topology induced by a complex hopping parameter. Inspired by the recent advances in the topology of non-Hermitian systems, in this work we study a non-Hermitian version of the topological checkerboard lattice. The complex band structure and Berry curvature are calculated. In the insulating phase, the Chern number is the same as in the Hermitian version, but the Hall conductivity is no longer quantized. The dependence of the Hall conductivity with the non-Hermitian parameters is investigated. The non-Hermiticity can be seen as a result of dissipation caused by coupling the system to the environment, so this study casts light on the topology of open systems in condensed matter physics.

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