Higher-order topological and nodal superconducting transition-metal sulfides MS (M=Nb and Ta)

Abstract

Intrinsic topological superconducting materials are exotic and vital to develop the next-generation topological superconducting devices, topological quantum calculations, and quantum information technologies. Here, we predict the topological and nodal superconductivity of NiAs-type MS (M=NbandTa) transition-metal sulfides. We reveal their higher-order topology nature with an index of Z4=2. These materials have a higher Tc than the Nb or Ta metal superconductors due to their flat band and strong electron-phonon coupling nature. Electron doping and lighter isotopes can effectively enhance the Tc. Our findings show that the MS (M=NbandTa) systems can be platforms to study exotic physics in the higher-order topological superconductors, and provide a theoretical support to utilize them as the topological superconducting devices in the field of advanced topological quantum calculations and information technologies.

Source-reported materials — not catalogue approval

Similar papers