Abstract
These years, two-dimensional (2D) superconductors have attracted more and more attentions. The critical temperature (\(T_\mathrm{c}\)) of superconductors can be modified by hole/electron doping, atom adsorption, strain and other means, so as to realize superconductivity with higher \(T_\mathrm{c}\). In this paper, using first-principles calculations, we study the superconductivity of monolayer hexagonal boron phosphide (h-BP) by metal atoms adsorption. The electronic structure and electron-phonon coupling (EPC) of MBP (M=Li, Na, Ti) are studied. It is found that monolayer h-BP transforms from a semiconductor to a metal after metal atoms adsorption. Based on the conventional EPC mechanism, the coupling between electrons and the out-of-plane vibration of B atoms and P atoms contributes greatly to the EPC. For MBP (M=Li, Na, Ti), the calculated total EPC \(\lambda\) are 1.76, 0.64, and 1.54, and the corresponding \(T_\mathrm{c}\) are 26.38, 6.05, and 14.58 K, respectively. Thus, the predicted MBP (M=Li, Na, Ti) are new 2D superconductors which might be used in future superconducting electronic devices.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (Grant Nos. 12074213, 11574108, and 12104253), the Major Basic Program of Natural Science Foundation of Shandong Province (Grant No. ZR2021ZD01), and the Project of Introduction and Cultivation for Young Innovative Talents in Colleges and Universities of Shandong Province.
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Liu, BT., Li, YP. & Lu, HY. Phonon-mediated Superconductivity in Two-dimensional MBP (M=Li, Na, Ti). J Low Temp Phys 210, 129–139 (2023). https://doi.org/10.1007/s10909-022-02841-6
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DOI: https://doi.org/10.1007/s10909-022-02841-6