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Unusual spin-triplet superconductivity in monolayer graphene

Author

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  • V. Apinyan

    (Polish Academy of Sciences)

  • M. Sahakyan

    (Polish Academy of Sciences)

Abstract

In this paper, we consider the phonons in monolayer graphene and we show the possibility for the spin-triplet superconducting excitations states by discretizing the single-particle excitations near Fermi wave vector. The monolayer graphene was supposed to be exposed under the influence of the external gate-potential and the local Coulomb interaction effects have been taken into account at each lattice site position in the monolayer. A sufficiently large temperature domain was found, where the superconducting order parameter is not vanishing. Corresponding to this, at the surprisingly high temperature limit, we obtain a narrow domain of the electron–phonon coupling parameter $$\lambda _\textrm{eff}$$ λ eff , emphasizing the superconducting state. We discuss the localizing role of Hubbard-U interaction and the effects external gate potential on the calculated physical parameters in the system. We explain the importance of the chemical potential in the formation of the superconducting state. We show the existence of a large superconducting band-gap in the system even in the case of the absence of the applied electric field potential. Graphical Abstract

Suggested Citation

  • V. Apinyan & M. Sahakyan, 2024. "Unusual spin-triplet superconductivity in monolayer graphene," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 97(6), pages 1-20, June.
    • Handle: RePEc:spr:eurphb:v:97:y:2024:i:6:d:10.1140_epjb_s10051-024-00723-2
    DOI: 10.1140/epjb/s10051-024-00723-2
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    References listed on IDEAS

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    1. Mir Mohammad Sadeghi & Yajie Huang & Chao Lian & Feliciano Giustino & Emanuel Tutuc & Allan H. MacDonald & Takashi Taniguchi & Kenji Watanabe & Li Shi, 2023. "Tunable electron–flexural phonon interaction in graphene heterostructures," Nature, Nature, vol. 617(7960), pages 282-286, May.
    2. Haidong Tian & Xueshi Gao & Yuxin Zhang & Shi Che & Tianyi Xu & Patrick Cheung & Kenji Watanabe & Takashi Taniguchi & Mohit Randeria & Fan Zhang & Chun Ning Lau & Marc W. Bockrath, 2023. "Evidence for Dirac flat band superconductivity enabled by quantum geometry," Nature, Nature, vol. 614(7948), pages 440-444, February.
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