  Heterostructures between two-dimensional quantum spin Hall insulators (QSHI)
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$^\prime$-WTe$_2$ and s-wave superconductor 2H-NbSe$_2$.
We find that even in the presence of strong inter-layer 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 inter-layer hybridization and realize a spatial interface between a
regime with a clean QSHI gap and a topological conducting edge state.
