Topological superconductivity at the edge of transition-metal dichalcogenides
Gang Xu, Jing Wang, Binghai Yan, Xiao-Liang Qi
DOI 10.1103/PhysRevB.90.100505 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
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 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 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° corner of a MX2 flake in proximity to a superconducting substrate.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | Pressure not reported | unknown |
Similar papers
Topological superconductivity at the edge of transition metal dichalcogenides
similarity 0.94Gang Xu et al. · 2013 · arXiv:1308.5664
Source status unknown — claims are unverified
Higher-order topological and nodal superconducting transition-metal sulfides MS (M=Nb and Ta)
similarity 0.93Yipeng An et al.
Source status unknown — claims are unverified
Proximity-induced superconductivity in Landau-quantized graphene monolayers
similarity 0.93Laura Cohnitz et al.
Source status unknown — claims are unverified
Evidence of nodes in the order parameter of the superconducting doped topological insulator NbxBi2Se3 via penetration depth measurements
similarity 0.92M. P. Smylie et al.
Source status unknown — claims are unverified
High-Tc and three-gap two-dimensional superconductors with electronic and phononic topology: KB2C2
similarity 0.92Hao-Dong Liu et al.
Source status unknown — claims are unverified
Role of interface hybridization on induced superconductivity in 1T′−WTe2 and 2H−NbSe2 heterostructures
similarity 0.92Anirban Das et al.
Source status unknown — claims are unverified