Crystal structures for topological insulator YB₆ and topological crystaline Kondo insulator YB₁₂ (top and bottom left), with corresponding bulk (top right) and surface (bottom right) Brillouin zones.

From the article:

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 (2014)

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