期刊
PHYSICAL REVIEW LETTERS
卷 103, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.206805
关键词
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资金
- NSERC
- CIfAR
- The China Scholarship Council
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.
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