Anistrotropic two-gap superconductivity and electron-phonon coupling in 2H-NbS$_2$

ORAL

Abstract

We investigate from first principles the nature of the superconducting state of 2$H$-NbS$_2$ using the fully anisotropic Migdal-Eliashberg theory, including Coulomb interactions. In agreement with experiment we find two superconducting gaps, which we map onto the Fermi surface and analyse in terms of the electronic orbital character. In addition, we investigate the electron-phonon interaction underlying the superconducting pairing and compare it to similar transition-metal dicalchogenides.

*This work was supported by the Austrian Science Fund (PN J 3806-N36), the Leverhulme Trust (Grant RL-2012-001), UK research grants EP/J009857/1 and EP/M020517/1, and GrapheneCore1 No.~696656

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Authors

  • Christoph Heil

    • University of Oxford

  • Samuel Ponc\'{e}

    • University of Oxford

  • Henry Lambert

    • King's College London

  • Elena Roxana Margine

    • Binghamton University-SUNY
    • Binghamton University, State University of New York

  • Feliciano Giustino

    • University of Oxford