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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2504.20868 |
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| _version_ | 1866916748963348480 |
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| author | Xiong, Si-Yi Jiang, Peng Wang, Yiming Li, Yan-Ling |
| author_facet | Xiong, Si-Yi Jiang, Peng Wang, Yiming Li, Yan-Ling |
| contents | 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 Nb$_x$N$_{x+1}$ ($x$ = 1-4) monolayers derived from the NbN bulk exfoliated along the (001) plane, as identified through first-principles calculations. Among these monolayers, Nb$_2$N$_3$, which crystallizes in the $P \overline{6} m2$ symmetry, stands out with an exceptional superconducting transition temperature of 77.8 K, setting a new high-$T_c$ benchmark for two-dimensional transition metal nitrides and binary compounds. Our detailed analysis reveals that the strong superconductivity in Nb$_2$N$_3$ is driven by phonon modes dominated by N vibrations, with significant electron-phonon coupling contributions from N-$p$ and Nb-$d$ electronic states. Using the anisotropic Migdal-Eliashberg framework, we further determine the two-gap nature of the superconductivity in the Nb$_2$N$_3$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_20868 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-dimensional non-van der Waals niobium nitride nanosheets with high-temperature two-gap superconductivity Xiong, Si-Yi Jiang, Peng Wang, Yiming Li, Yan-Ling Superconductivity Mesoscale and Nanoscale Physics Materials Science 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 Nb$_x$N$_{x+1}$ ($x$ = 1-4) monolayers derived from the NbN bulk exfoliated along the (001) plane, as identified through first-principles calculations. Among these monolayers, Nb$_2$N$_3$, which crystallizes in the $P \overline{6} m2$ symmetry, stands out with an exceptional superconducting transition temperature of 77.8 K, setting a new high-$T_c$ benchmark for two-dimensional transition metal nitrides and binary compounds. Our detailed analysis reveals that the strong superconductivity in Nb$_2$N$_3$ is driven by phonon modes dominated by N vibrations, with significant electron-phonon coupling contributions from N-$p$ and Nb-$d$ electronic states. Using the anisotropic Migdal-Eliashberg framework, we further determine the two-gap nature of the superconductivity in the Nb$_2$N$_3$ 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. |
| title | Two-dimensional non-van der Waals niobium nitride nanosheets with high-temperature two-gap superconductivity |
| topic | Superconductivity Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2504.20868 |