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强关联拓扑绝缘体SmB₆模型中的独特拓扑晶相

Distinct Topological Crystalline Phases in Models for the Strongly Correlated Topological Insulator SmB_{6}.

作者信息

Baruselli Pier Paolo, Vojta Matthias

机构信息

Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany.

出版信息

Phys Rev Lett. 2015 Oct 9;115(15):156404. doi: 10.1103/PhysRevLett.115.156404.

Abstract

SmB_{6} was recently proposed to be both a strong topological insulator and a topological crystalline insulator. For this and related cubic topological Kondo insulators, we prove the existence of four different topological phases, distinguished by the sign of mirror Chern numbers. We characterize these phases in terms of simple observables, and we provide concrete tight-binding models for each phase. Based on theoretical and experimental results for SmB_{6} we conclude that it realizes the phase with C_{k_{z}=0}^{+}=+2, C_{k_{z}=π}^{+}=+1, C_{k_{x}=k_{y}}^{+}=-1, and we propose a corresponding minimal model.

摘要

最近有人提出SmB₆既是一种强拓扑绝缘体,也是一种拓扑晶体绝缘体。对于这种以及相关的立方拓扑近藤绝缘体,我们证明了存在四种不同的拓扑相,它们由镜面陈数的符号区分。我们根据简单的可观测量来表征这些相,并为每个相提供具体的紧束缚模型。基于SmB₆的理论和实验结果,我们得出它实现了Cₖₜ=₀⁺ = +2、Cₖₜ=ₚ⁺ = +1、Cₖₓ=ₖᵧ⁺ = -1的相,并且我们提出了一个相应的最小模型。

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