Topological phases in a three-dimensional topological insulator with a time-reversal invariant external field
Topological phases in a three-dimensional topological insulator with a time-reversal invariant external field
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具有时间反转不变外场的三维拓扑绝缘体中的拓扑相
DOI:
10.1088/0031-8949/89/10/105801
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发表时间:
2014-08
期刊:
影响因子:
--
通讯作者:
Xiaoyong Guo, Xiaobin Ren,Guangzhi Wang, Jie Peng
中科院分区:
文献类型:
--
作者:
Xiaoyong Guo, Xiaobin Ren,Guangzhi Wang, Jie Peng
We investigate the impact of a time-reversal invariant external field on the topological phases of a three-dimensional (3D) topological insulator. By taking the momentum k z as a parameter, we calculate the spin-Chern number analytically. It is shown that both the quantum spin Hall phase and the integer quantum Hall phase can be realized in our system. When the strength of the external field is varied, a series of topological phase transitions occurs with the closing of the energy gap or the spin-spectrum gap. In a tight-binding form, the surface modes are discussed numerically to confirm the analytically results.
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