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Spin-directed network model for the surface states of weak three-dimensional Z(2) topological insulators

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Title: Spin-directed network model for the surface states of weak three-dimensional Z(2) topological insulators
Authors: Obuse, Hideaki Browse this author →KAKEN DB
Ryu, Shinsei Browse this author
Furusaki, Akira Browse this author
Mudry, Christopher Browse this author
Issue Date: 21-Apr-2014
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 89
Issue: 15
Start Page: 155315-1
End Page: 155315-28
Publisher DOI: 10.1103/PhysRevB.89.155315
Abstract: A two-dimensional spin-directed Z(2) network model is constructed that describes the combined effects of dimerization and disorder for the surface states of a weak three-dimensional Z(2) topological insulator. The network model consists of helical edge states of two-dimensional layers of Z(2) topological insulators which are coupled by time-reversal-symmetric interlayer tunneling. It is argued that, without dimerization of interlayer couplings, the network model has no insulating phase for any disorder strength. However, a sufficiently strong dimerization induces a transition from a metallic phase to an insulating phase. The critical exponent. for the diverging localization length at metal-insulator transition points is obtained by finite-size scaling analysis of numerical data from simulations of this network model. It is shown that the phase transition belongs to the two-dimensional symplectic universality class of Anderson transition.
Rights: ©2014 American Physical Society
Type: article
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: 小布施 秀明

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