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  Topological superconductivity at the edge of transition-metal dichalcogenides

Xu, G., Wang, J., Yan, B., & Qi, X.-L. (2014). Topological superconductivity at the edge of transition-metal dichalcogenides. Physical Review B, 90(10): 100505. doi:10.1103/PhysRevB.90.100505.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-F3C4-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-F3C5-D
Genre: Journal Article

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 Creators:
Xu, Gang1, Author
Wang, Jing1, Author              
Yan, Binghai2, Author              
Qi, Xiao-Liang1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863427              

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 Abstract: Time-reversal breaking topological superconductors are new states of matter which can support Majorana zero modes at the edge. In this Rapid Communication, we propose a different realization of one-dimensional topological superconductivity and Majorana zero modes. The proposed system consists of a monolayer of transition-metal dichalcogenides M X-2 (M = Mo, W; X = S, Se) on top of a superconducting substrate. Based on first-principles calculations, we show that a zigzag edge of the monolayer M X-2 terminated by a metal atom M has edge states with strong spin-orbit coupling and spontaneous magnetization. By proximity coupling with a superconducting substrate, topological superconductivity can be induced at such an edge. We propose NbS2 as a natural choice of substrate, and estimate the proximity induced superconducting gap based on first-principles calculation and a low energy effective model. As an experimental consequence of our theory, we predict that Majorana zero modes can be detected at the 120 degrees corner of a M X-2 flake in proximity to a superconducting substrate.

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Language(s): eng - English
 Dates: 20142014-09-12
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 90 (10) Sequence Number: 100505 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008