Quantum spin Hall effect in a two-orbital model on a honeycomb lattice

The spin Hall effect is investigated in a two-orbital tight-binding model on a honeycomb lattice. We show that the model exhibits three topologically-different insulating phases at half filling, which are distinguished by different quantized values of the spin Hall conductivity. We analytically dete...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 592; no. 1; p. 12131
Main Authors Hayami, Satoru, Kusunose, Hiroaki, Motome, Yukitoshi
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 18.03.2015
Subjects
Conduction bands
Electromagnetism
Physics
Quantum Hall effect
Spin-orbit interactions
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Summary:The spin Hall effect is investigated in a two-orbital tight-binding model on a honeycomb lattice. We show that the model exhibits three topologically-different insulating phases at half filling, which are distinguished by different quantized values of the spin Hall conductivity. We analytically determine the phase boundaries, where the valence and conduction bands touch with each other with forming the Dirac nodes at the Fermi level. The results are discussed in terms of the effective antisymmetric spin-orbit coupling. The relation to the Kane- Mele model and implications for a magnetoelectric effect are also discussed.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/592/1/012131