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Enhanced Electron–Phonon Coupling and Superconductivity in Two-dimensional BC2N via Lithium Deposition: a First-Principles Investigation

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Abstract

Two-dimensional (2D) superconductors are important both for the basic understanding of pairing mechanism and potential applications in nanosuperconducting quantum interference devices. In this work, we explore the phonon-mediated superconductivity of hole-doped and lithium-deposited monolayer BC2N by first-principles calculations. Our results reveal that the hole-doped planar BC2N cannot superconduct due to weak electron–phonon coupling (EPC) with λ = 0.07. When lithium is deposited on the monolayer, the EPC constant is enhanced significantly to 0.52 and the superconducting transition temperature Tc is determined to be 3.58 K. Because more phonons, in particular the out-of-plane modes, are triggered to participate in the EPC process, the Tc is higher than 1.4 K of Ca-deposited graphene, 1.3 K of Li-deposited stanene, and 3 K of doped WS2 and NbSe2. It is also found that tensile biaxial strain weakens the EPC and leads to a decreased superconducting transition temperature. Our findings will provide a new guideline for designing novel 2D superconductors and enrich the potential application of 2D BC2N.

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Funding

The authors acknowledge the support from the National Natural Science Foundation of China (No. 11747008) and Guangxi Natural Science Foundation (No. 2019GXNSFBA245077).

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Authors and Affiliations

  1. Faculty of Science, Guilin University of Aerospace Technology, Guilin, 541004, Guangxi, China

    Jianyong Chen

  2. Powder Metallurgy Research Institute, and State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, China

    Jianyong Chen

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Conceptualization: Jianyong Chen; writing—original draft preparation: Jianyong Chen; writing—review and editing: Jianyong Chen; supervision: Jianyong Chen.

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Correspondence to Jianyong Chen.

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Chen, J. Enhanced Electron–Phonon Coupling and Superconductivity in Two-dimensional BC2N via Lithium Deposition: a First-Principles Investigation. J Supercond Nov Magn 34, 391–398 (2021). https://doi.org/10.1007/s10948-020-05737-2

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