![]() The black dashed line indicates the DOS of normal state, which is normalized to 1 at the Fermi level. (b) Quasiparticle DOS in the superconducting state for two representative temperatures of 6 K (red dashed line) and 18 K (blue dash-dotted line). (a) The phonon spectrum and phonon density of states (PhDOS) (multiply 5), Eliashberg spectral function α 2 F ( ω ), and the cumulative frequency-dependent of EPC λ ( ω ) of monolayer W 2 N 3 at ambient pressure. ![]() Our findings not only provide a platform to study the emergent phenomena in 2D topological superconductors, but also open a door to discover more 2D high-temperature topological superconductors in van der Waals materials. Because of the strong electron and lattice coupling, the monolayer displays a non-Fermi liquid behavior in its normal states at temperatures lower than 80 K, where the specific heat exhibits T 3 behavior and the Wiedemann-Franz law is dramatically violated. Moreover, the monolayer W 2 N 3 is unveiled to be a superconductor with the superconducting transition temperature T C ∼ 22 K and a superconducting gap of about 5 meV based on the anisotropic Migdal-Eliashberg formalism, arising from the strong electron-phonon coupling around the Γ point, and the 2D superconductor is phonon mediated and fits the BCS mechanism with an Ising-type pairing. Owing to the Van Hove singularities, the density of states near the Fermi level are high, making the monolayer a compensate metal. Here, we find a 2D monolayer W 2 N 3, which can be exfoliated from its real van der Waals bulk material with much lower exfoliation energy than MoS 2, to be a topological metal with exotic topological states at different energy levels. However, there are few reports about 2D superconductors, let alone topological superconductors. Two-dimensional (2D) topological superconductors are highly desired because they not only offer opportunities for exploring novel exotic quantum physics but also possess potential applications in quantum computation. ![]()
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