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Two-dimensional (2D) topological superconductors are highly desired becausethey not only offer opportunities for exploring novel exotic quantum physics,but also possesses potential applications in quantum computation. However,there are few reports on 2D superconductors, let alone topologicalsuperconductors. Here, we find a 2D monolayer W$_2$N$_3$, which can beexfoliated from its real van der Waals bulk material with much lowerexfoliation energy than MoS$_2$, to be a topological metal with exotictopological states at different energy level. Due to the Van Hovesingularities, the density of states near Fermi level are high, making themonolayer a compensate metal. Moreover, the monolayer W$_2$N$_3$ is unveiled tobe a superconductor with the superconducting transition temperature Tc $\sim$22 K and a superconducting gap of about 5 meV based on the anisotropicMigdal-Eliashberg formalism, arising from the strong electron-phonon couplingaround the $\Gamma$ point. Because of the strong electron and lattice coupling,the monolayer displays a non-Fermi liquid behavior in its normal states attemperatures lower than 80 K, where the specific heat exhibit T$^3$ behaviorand the Wiedemann-Franz law dramatically violates. Our findings not onlyprovide the platform to study the emergent phenomena in 2D topologicalsuperconductors, but also open a door to discover more 2D high-temperaturetopological superconductors in van der Waals materials.

Two-dimensional topological superconductivity candidate in van der Waals layered material