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Robustness of gapless interface states in a junction of two topological insulators

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Title: Robustness of gapless interface states in a junction of two topological insulators
Authors: Habe, Tetsuro Browse this author
Asano, Yasuhiro Browse this author →KAKEN DB
Issue Date: 31-Oct-2013
Publisher: Amer physical soc
Journal Title: Physical review b
Volume: 88
Issue: 15
Start Page: 155442-1
End Page: 155442-12
Publisher DOI: 10.1103/PhysRevB.88.155442
Abstract: We theoretically study subgap states appearing at the interface between two three-dimensional topological insulators which have different configurations in the spin-orbit interactions from each other. The coupling of spin sigma with momenta p is configured by a material dependent 3 x 3 matrix A as sigma(mu) A(mu)(nu)P(nu). The spectra of the interface subgap states depend on the relative choices of A's in the two topological insulators where the two A are connected by the unitary transformation including the inversion and the rotation in momentum space. The gapless states appear at the interface when the transformation includes the inversion. The two topological insulators can be distinguished by using the topological numbers defined in the two- or one-dimensional partial Brillouin zone, which explains the presence of the gapless interface states. We also discuss the robustness of such gapless states under perturbations breaking the time-reversal symmetry or the band-inversion symmetry.
Rights: ©2013 American Physical Society
Type: article
URI: http://hdl.handle.net/2115/54758
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浅野 泰寛

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