Role of interface hybridization on induced superconductivity in 1T′−WTe2 and 2H−NbSe2 heterostructures

Heterostructures between two-dimensional quantum spin Hall insulators (QSHI) \nand superconducting materials can allow for the presence of Majorana Fermions \nat their conducting edge states. Although a strong interface hybridization \nhelps induce a reasonable superconducting gap on the topological material, the \nhybridization can modify the material's electronic structure. In this work, we \nutilize a realistic low-energy model with tunable interlayer hybridization to \nstudy the edge state physics in a heterostructure between monolayer quantum \nspin Hall insulator 1T$^\\prime$-WTe$_2$ and s-wave superconductor 2H-NbSe$_2$. \nWe find that even in the presence of strong inter-layer hybridization that \nrenders the surface to become conducting, the edge state shows a significantly \nenhanced local density of states and induced superconductivity compared to the \nsurface. We provide an alternate heterostructure geometry that can utilize the \nstrong inter-layer hybridization and realize a spatial interface between a \nregime with a clean QSHI gap and a topological conducting edge state.