Role of interface hybridization on induced superconductivity in 1T′−WTe2 and 2H−NbSe2 heterostructures
Anirban Das, Bent Weber, Shantanu Mukherjee
DOI 10.1103/PhysRevB.108.075410 · Physical Review B
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Abstract
Heterostructures between two-dimensional quantum spin Hall insulators (QSHIs) and superconducting materials can allow for the presence of Majorana fermions at their conducting edge states. Although a strong interface hybridization helps induce a reasonable superconducting gap on the topological material, the hybridization can modify the material's electronic structure. In this work, we utilize a realistic low-energy model with tunable interlayer hybridization to study the edge-state physics in a heterostructure between monolayer quantum spin Hall insulator 1T′-WTe2 and s-wave superconductor 2H-NbSe2. We find that even in the presence of strong interlayer hybridization that renders the surface to become conducting, the edge state shows a significantly enhanced local density of states and induced superconductivity compared to the surface. We provide an alternate heterostructure geometry that can utilize the strong interlayer hybridization and realize a spatial interface between a regime with a clean QSHI gap and a topological conducting edge state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | unknown |
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