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Quantum spin Hall effect in two-dimensional transition-metal dichalcogenide haeckelites

S. M. Nie, Zhida Song, Hongming Weng, and Zhong Fang
Phys. Rev. B 91, 235434 – Published 19 June 2015

Abstract

Based on first-principles calculations, we have found that a family of two-dimensional transition-metal dichalcogenide haeckelites with square-octagonal lattice MX248(M=Mo,WandX=S,SeandTe) can host quantum spin Hall effect. The phonon spectra indicate that they are dynamically stable, and the largest band gap is predicted to be around 54 meV. These will pave the way for potential applications of topological insulators. We have also established a simple tight-binding model on a squarelike lattice to achieve a topologically nontrivial quantum state, which extends the study from honeycomb lattice to squarelike lattice and broadens the promising topological material systems greatly.

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  • Received 9 April 2015
  • Revised 27 May 2015

DOI:https://doi.org/10.1103/PhysRevB.91.235434

©2015 American Physical Society

Authors & Affiliations

S. M. Nie1, Zhida Song1, Hongming Weng1,2,*, and Zhong Fang1,2,†

  • 1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Collaborative Innovation Center of Quantum Matter, Beijing, 100084, China

  • *hmweng@iphy.ac.cn
  • zfang@iphy.ac.cn

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Issue

Vol. 91, Iss. 23 — 15 June 2015

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