Two-dimensional non-van der Waals niobium nitride nanosheets with high-temperature two-gap superconductivity
arXiv:2504.20868 · doi:10.1103/PhysRevB.111.205426
Abstract
The exploration of the superconductivity in two-dimensional materials has garnered significant attention due to their promising low-power applications and fundamental scientific interest. Here, we report some novel stable non-van der Waals NbN ( = 1-4) monolayers derived from the NbN bulk exfoliated along the (001) plane, as identified through first-principles calculations. Among these monolayers, NbN, which crystallizes in the symmetry, stands out with an exceptional superconducting transition temperature of 77.8 K, setting a new high- benchmark for two-dimensional transition metal nitrides and binary compounds. Our detailed analysis reveals that the strong superconductivity in NbN is driven by phonon modes dominated by N vibrations, with significant electron-phonon coupling contributions from N- and Nb- electronic states. Using the anisotropic Migdal-Eliashberg framework, we further determine the two-gap nature of the superconductivity in the NbN monolayer, characterized by pronounced electron-phonon coupling and anisotropic energy gaps. These results advance our understanding of superconductivity in 2D transition metal nitride and highlight their potential for nanoscale superconducting applications.
arXiv comment8 pages, 4 figures
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