Prediction of phonon-mediated superconductivity with high critical temperature in the two-dimensional topological semimetal W2N3

Abstract

Two-dimensional superconductors attract great interest both for their fundamental physics and for their potential applications, especially in the rapidly growing field of quantum computing. Despite intense theoretical and experimental efforts, materials with a reasonably high transition temperature are still rare. Even more rare are those that combine superconductivity with a non-trivial band topology, to potentially host exotic states of matter such as Majorana fermions. Here, we predict a remarkably high superconducting critical temperature of 21-28 K in the easily exfoliable, topologically non-trivial 2D semimetal W2N3 . By studying its electronic and superconducting properties as a function of doping and strain, we find large changes in the electron-phonon interactions that make this material a unique platform to study different coupling regimes and test the limits of current theories of superconductivity. Last, we discuss the possibility of tuning the material to achieve coexistence of superconductivity and topologically non-trivial edge states.

17 pages 10 figures

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• Superconducting properties of doped blue phosphorene: Effects of non-adiabatic approach
• Charting the landscape of Bardeen-Cooper-Schrieffer superconductors in experimentally known compounds
• Two-dimensional non-van der Waals niobium nitride nanosheets with high-temperature two-gap superconductivity
• Large modulation of thermal transport in 2D semimetal triphosphides by doping-induced electron-phonon coupling
• Phonon state tomography of electron correlation dynamics in optically excited solids
• Perturbing finite temperature multicomponent DFT 1D Kohn-Sham systems: Peierls Gap & Kohn Anomaly
• Single layer clathrane: A potential superconducting two-dimensional (2D) hydrogenated metal borocarbide
• Massive Discovery of Low-Dimensional Materials from Universal Computational Strategy
• Overscreening-free electron-phonon interaction in realistic materials