Topological phases of a three-dimensional topological insulator with structure inversion asymmetry

被引：2
|
作者：
Guo, Xiaoyong [1 ]
Wang, Zaijun [2 ]
Zheng, Qiang [3 ]
Peng, Jie [4 ]
机构：
[1] Tianjin Univ Sci & Technol, Sch Sci, Tianjin 300457, Peoples R China
[2] Tianjin Univ Technol & Educ, Sch Sci, Tianjin 300222, Peoples R China
[3] Guizhou Normal Univ, Sch Math & Comp Sci, Guiyang 550001, Guizhou, Peoples R China
[4] Xiangtan Univ, Sch Phys & Optoelect, Lab Quantum Engn & Micronano Energy Technol, Xiangtan 411105, Hunan, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2015年 / 29卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Three-dimensional topological insulator; spin Chern number; structure inversion asymmetry; QUANTIZED HALL CONDUCTANCE; HGTE QUANTUM-WELLS; SUPERCONDUCTORS; TRANSITION;
D O I：
10.1142/S0217979215500344
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigate the topological phases of a three-dimensional (3D) topological insulator (TI) without the top-bottom inversion symmetry. We calculate the momentum depended spin Chern number to extract the phase diagram. Various phases are found and we address the dependence of phase boundaries on the strength of inversion asymmetry. Opposite to the quasi-two-dimensional thin film TI, in our 3D system the TI state is stabilized by the structure inversion asymmetry (SIA). With a strong SIA the 3D TI phase can exist even under a large Zeeman field. In a tight-binding form, the surface modes are discussed to confirm with the phase diagram. Particularly we find that the SIA cannot destroy the surface states but open a gap on its spectrum.
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收藏
页数：10
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