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:
Phys. Scr.
影响因子:
--
通讯作者:
Xiaoyong Guo, Xiaobin Ren,Guangzhi Wang, Jie Peng
Xiaoyong Guo, Xiaobin Ren,Guangzhi Wang, Jie Peng
中科院分区:
其他
文献类型:
--
作者:
Xiaoyong Guo, Xiaobin Ren,Guangzhi Wang, Jie Peng

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研究了时反不变外场对三维拓扑绝缘体拓扑相位的影响。以动量kz为参数,解析地计算了自旋-陈数.结果表明,在我们的系统中可以实现量子自旋霍尔相位和整数量子霍尔相位。当外场强度变化时,随着能隙或自旋谱带隙的闭合,会发生一系列拓扑相变。在紧束缚的形式,表面模式进行了讨论,数值证实了解析结果。
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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