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Superconductivity and band topology of double-layer honeycomb structure M2N2 (M = Nb, Ta) |
| Jin-Han Tan(谭锦函)1, Na Jiao(焦娜)1, Meng-Meng Zheng(郑萌萌)1,†, Ping Zhang(张平)1,2, and Hong-Yan Lu(路洪艳)1,‡ |
1 School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China;
2 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China |
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Abstract Two-dimensional double-layer honeycomb (DLHC) materials are known for their diverse physical properties, but superconductivity has been a notably absent characteristic in this structure. We address this gap by investigating $M_{2}$N$_{2}$ ($M = {\rm Nb}$, Ta) with DLHC structure using first-principles calculations. Our results show that $M_{2}$N$_{2}$ are stable and metallic, exhibiting superconducting behavior. Specifically, Nb$_{2}$N$_{2}$ and Ta$_{2}$N$_{2}$ display superconducting transition temperatures of 6.8 K and 8.8 K, respectively. Their electron-phonon coupling is predominantly driven by the coupling between metal d-orbitals and low-frequency metal-dominated vibration modes. Interestingly, two compounds also exhibit non-trivial band topology. Thus, $M_{2}$N$_{2}$ are promising platforms for studying the interplay between topology and superconductivity and fill the gap in superconductivity research for DLHC materials.
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Received: 16 June 2025
Revised: 07 July 2025
Accepted manuscript online: 10 July 2025
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PACS:
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74.20.Pq
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(Electronic structure calculations)
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74.25.-q
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(Properties of superconductors)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.78.-w
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(Superconducting films and low-dimensional structures)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074213 and 11574108), the National Key R&D Program of China (Grant No. 2022YFA1403103), the Major Basic Program of Natural Science Foundation of Shandong Province (Grant No. ZR2021ZD01), the Natural Science Foundation of Shandong Province (Grant No. ZR2023MA082), and the Project of Introduction and Cultivation for Young Innovative Talents in Colleges and Universities of Shandong Province. |
Corresponding Authors:
Meng-Meng Zheng, Hong-Yan Lu
E-mail: qfzhmm@163.com;hylu@qfnu.edu.cn
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Cite this article:
Jin-Han Tan(谭锦函), Na Jiao(焦娜), Meng-Meng Zheng(郑萌萌), Ping Zhang(张平), and Hong-Yan Lu(路洪艳) Superconductivity and band topology of double-layer honeycomb structure M2N2 (M = Nb, Ta) 2025 Chin. Phys. B 34 097402
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