Protection of the surface states in topological insulators: Berry phase perspective
Protection of the surface states in topological insulators: Berry phase perspective
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DOI：
10.1103/physrevb.87.205409
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发表时间：
2013-05-07
影响因子：
3.7
通讯作者：
Takane, Yositake
中科院分区：
文献类型：
--
作者：
Imura, Ken-Ichiro;Takane, Yositake
拓扑绝缘体(TI)的金属表面态不仅受拓扑保护，而且具有在曲面上诱导有效矢势的显著特性。对于球形或圆柱形TI(TI纳米颗粒或纳米线)表面态的电子，有效地诱导出伪磁单极或虚拟螺线管，编码了系统的几何形状。这里，以双曲曲面为例，我们证明了由于这一性质源于它的主动自旋自由度，表面态本身是拓扑保护的。
The metallic surface state of a topological insulator (TI) is not only topologically protected, but it exhibits a remarkable property of inducing an effective vector potential on curved surfaces. For an electron in the surface state of a spherical or a cylindrical TI (TI nanoparticle or nanowire), a pseudomagnetic monopole or a fictitious solenoid is effectively induced, encoding the geometry of the system. Here, by using a hyperbolic surface as an example, we demonstrate that as a consequence of this property stemming from its active spin degree of freedom, the surface state is by itself topologically protected.