Topological Crystalline Kondo Insulator in Mixed Valence Ytterbium Borides

Hongming Weng, Jianzhou Zhao, Zhijun Wang, Zhong Fang, and Xi Dai

Phys. Rev. Lett. 112, 016403 – Published 7 January 2014

Abstract

The electronic structures of two mixed valence insulators $YbB_{6}$ and $YbB_{12}$ are studied by using the local density approximation supplemented with the Gutzwiller method and dynamic mean field theory. $YbB_{6}$ is found to be a moderately correlated $Z_{2}$ topological insulator, similar to $SmB_{6}$ but having much larger bulk band gap. Notably, $YbB_{12}$ is revealed to be in a new novel quantum state, strongly correlated topological crystalline Kondo insulator, which is characterized by its nonzero mirror Chern number. The surface calculations find an odd (three) and an even (four) number of Dirac cones for $YbB_{6}$ and $YbB_{12}$ , respectively.

Received 13 September 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.016403

Authors & Affiliations

Hongming Weng^1,2, Jianzhou Zhao¹, Zhijun Wang¹, Zhong Fang^1,2, and Xi Dai^1,2

¹Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
²Collaborative Innovation Center of Quantum Matter, Beijing 100190, China

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Vol. 112, Iss. 1 — 10 January 2014

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