Impurity states in the quantum spin Hall phase in graphene

被引：18
|
作者：
Gonzalez, J. W. [1 ]
Fernandez-Rossier, J. [1 ,2 ]
机构：
[1] Int Iberian Nanotechnol Lab INL, P-4715330 Braga, Portugal
[2] Univ Alicante, Dept Fis Aplicada, Alicante 03690, Spain
来源：
PHYSICAL REVIEW B | 2012年 / 86卷 / 11期
关键词：
EDGE STATES; SUPERCONDUCTOR; CONDUCTANCE; SURFACE; WELLS;
D O I：
10.1103/PhysRevB.86.115327
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Two-dimensional insulators with time-reversal symmetry can have two topologically different phases, the quantum spin Hall and the normal phase. The former is revealed by the existence of conducting edge states that are topologically protected. Here we show that the reaction to impurity, in bulk, is radically different in the two phases and can be used as a marker for the topological phase. Within the context of the Kane-Mele model for graphene, we find that strictly normalizable in-gap impurity states only occur in the quantum spin Hall phase and carry a dissipationless current whose chirality is determined by the spin and pseudospin of the residing electron.
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页数：5
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