Metacinnabar（β- HgS）：一个具有高度各向异性表面态的强三维拓扑绝缘体
Metacinnabar (β-HgS): a strong 3D topological insulator with highly anisotropic surface states
摘要：
我们建立了拓扑保护的边缘状态的存在下的（001）表面的HgS的锌-双金属结构使用密度泛函电子结构计算。边态锥的狄拉克点非常接近体价带最大值。狄拉克锥是极端各向异性的，具有沿着表面基本单元x'的一个对角线的非常大的电子速度和在垂直方向y'上的几乎平坦的色散。强的各向异性起源于表面的四重旋转反转对称性的破坏。
英文摘要：
We establish the presence of topologically protected edge states on the (001) surface of HgS in the zinc-blende structure using density-functional electronic structure calculations. The Dirac point of the edge state cone is very close to the bulk valence band maximum. The Dirac cone is extremely anisotropic with a very large electron velocity along one diagonal of the surface elementary cell x' and a nearly flat dispersion in the perpendicular direction y'. The strong anisotropy originates from a broken fourfold rotoinversion symmetry at the surface.
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