Electronic structure of three-dimensional topological insulators: thickness dependence and warping effect

被引：2

作者：

Lu, Hong-Yan ^{[1
,2
]}

Wang, Da ^{[2
]}

Chen, San ^{[1
]}

Xiang, Yuan-Yuan ^{[2
]}

机构：

[1] Huaibei Normal Univ, Sch Phys & Elect Informat, Huaibei 235000, Peoples R China

[2] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL B | 2012年 / 85卷 / 09期

基金：

中国国家自然科学基金;

关键词：

SINGLE DIRAC CONE; BI2TE3; SURFACE; BI2SE3; LIMIT;

D O I：

10.1140/epjb/e2012-30630-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We theoretically study the electronic structure of a three-dimensional topological insulator using a 3D lattice model with a warping term included. Thickness dependence of the electronic structure and the shape of constant-energy contour at different energy are both investigated in this model. We demonstrate that an energy gap opens in the surface state when the thickness is below six quintuple layers and disappears for thicker topological insulators. With the increasing of energy, the shape of constant-energy contour of the surface state band gradually evolves from a point at Dirac point to a circle with increasing volume, then to a hexagon, and finally to a hexagram. We clarify that the critical thickness of six quintuple is not modified by the warping term and the appearance of a hexagram is not influenced by the finite size effect. These phenomena agree well with recent angle-resolved photoemission spectroscopy experiments.

引用

页数：5

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