期刊
PHYSICAL REVIEW B
卷 84, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.035443
关键词
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资金
- KAKENHI
- Innovative Areas, Topological Quantum Phenomena in Condensated Matter
- [19740189]
- Grants-in-Aid for Scientific Research [21540389, 23540461] Funding Source: KAKEN
A workable model for describing dislocation lines introduced into a three-dimensional topological insulator is proposed. We show how fragile surface Dirac cones of a weak topological insulator evolve into protected gapless helical modes confined to the vicinity of a dislocation line. It is demonstrated that surface Dirac cones of a topological insulator (either strong or weak) acquire a finite-size energy gap when the surface is deformed into a cylinder penetrating the otherwise surfaceless system. We show that, when a dislocation with a nontrivial Burgers vector is introduced, the finite-size energy gap plays the role of stabilizing the one-dimensional gapless states.
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