Topological insulator on the kagome lattice

被引：469

作者：

Guo, H. -M. ^{[1
]}

Franz, M. ^{[1
]}

机构：

[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 11期

基金：

加拿大自然科学与工程研究理事会;

关键词：

MODEL; STATE;

D O I：

10.1103/PhysRevB.80.113102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Itinerant electrons in a two-dimensional kagome lattice form a Dirac semimetal, similar to graphene. When lattice and spin symmetries are broken by various periodic perturbations this semimetal is shown to spawn interesting nonmagnetic insulating phases. These include a two-dimensional topological insulator with a non-trivial Z(2) invariant and robust gapless edge states, as well as dimerized and trimerized "Kekule" insulators. The latter two are topologically trivial but the Kekule phase possesses a complex order parameter with fractionally charged vortex excitations. A charge-density wave is shown to couple to the Dirac fermions as an effective axial gauge field.

引用

页数：4

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