Theory of topological Kondo insulators
Theory of topological Kondo insulators
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DOI：
10.1103/physrevb.85.045130
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发表时间：
2012-01-30
影响因子：
3.7
通讯作者：
Galitski, Victor
中科院分区：
文献类型：
--
作者：
Dzero, Maxim;Sun, Kai;Galitski, Victor
我们研究了近藤绝缘体的属性如何改变时，考虑到潜在的晶体场多重态的对称性。我们采用安德森晶格模型，并考虑其低能物理。我们发现，在一个大类的晶体场配置，近藤绝缘体可以开发一个拓扑非平凡的基态。这种拓扑近藤绝缘体与非物理大自旋轨道耦合的非相互作用绝缘体电连接，因此可以被视为相互作用驱动的拓扑绝缘体。通过计算近藤绝缘体的安德森晶格模型的纠缠谱，分析了该模型的纠缠熵.纠缠谱的计算结果与表面态的计算结果是一致的。最后，我们讨论了一般近藤绝缘体的最大局域Wannier波函数的构造。
We examine how the properties of the Kondo insulators change when the symmetry of the underlying crystal field multiplets is taken into account. We employ the Anderson lattice model and consider its low-energy physics. We show that in a large class of crystal field configurations, Kondo insulators can develop a topological nontrivial ground state. Such topological Kondo insulators are adiabatically connected to noninteracting insulators with unphysically large spin-orbit coupling, and as such may be regarded as interaction-driven topological insulators. We analyze the entanglement entropy of the Anderson lattice model of Kondo insulators by evaluating its entanglement spectrum. Our results for the entanglement spectrum are consistent with the surface state calculations. Last, we discuss the construction of the maximally localized Wannier wave functions for generic Kondo insulators.