Three-Dimensional Topological Insulators on the Pyrochlore Lattice

被引：114

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 LETTERS | 2009年 / 103卷 / 20期

基金：

加拿大自然科学与工程研究理事会;

关键词：

HGTE QUANTUM-WELLS; SINGLE DIRAC CONE; PHASE; SURFACE; STATE;

D O I：

10.1103/PhysRevLett.103.206805

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Electrons hopping on the sites of a three-dimensional pyrochlore lattice are shown to form topologically nontrivial insulating phases when the spin-orbit (SO) coupling and lattice distortions are present. Of 16 possible topological classes 9 are realized for various parameters in this model. Specifically, at half-filling an undistorted pyrochlore lattice with a SO term yields a "pristine" strong topological insulator with a Z(2) index (1;000). At quarter filling various strong and weak topological phases are obtained provided that both SO coupling and uniaxial lattice distortion are present. Our analysis suggests that many of the nonmagnetic insulating pyrochlores could be topological insulators.

引用

页数：4

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