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arXiv · 1308.5664

Topological superconductivity at the edge of transition metal dichalcogenides

Gang Xu·Jing Wang·Binghai Yan·Xiao-Liang Qi
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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 paper, we propose a new realization of one-dimensional topological superconductivity and Majorana zero modes. The proposed system consists of a monolayer of transition metal dichalcogenides MX2 (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 MX2 terminated by 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 low energy effective model. As an experimental consequence of our theory, we predict that Majorana zero modes can be detected at the 120 degree corner of a MX2 flake in proximity with a superconducting substrate.

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Gang Xu, Jing Wang, Binghai Yan, Xiao-Liang Qi. 2013-09-09. Topological superconductivity at the edge of transition metal dichalcogenides. https://doi.org/10.1103/physrevb.90.100505

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