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MA: Fachverband Magnetismus
MA 36: Focus Session: Ising Superconductivity in Monolayer Transition Metal Dichalcogenides (joint session TT/HL/MA)
MA 36.6: Vortrag
Donnerstag, 20. März 2025, 12:15–12:30, H36
Unconventional Pairing in Ising Superconductors: Application to Monolayer NbSe2 — •Subhojit Roy1, Andreas Kreisel2, Brian Andersen3, and Shantanu Mukherjee4 — 1Indian Instititute of Technology Madras, Chennai, 600036, India — 2Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark — 3Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark — 4Indian Instititute of Technology Madras, Chennai, 600036, India
The presence of a non-centrosymmetric crystal structure and in-plane mirror symmetry allows an Ising spin-orbit coupling to form in some two-dimensional materials, where a nontrivial nature of the superconducting state is currently being explored. In this study(1), we develop a microscopic formalism for Ising superconductors that captures the superconducting instability arising from a momentum-dependent spin- and charge-fluctuation-mediated pairing interaction. We apply our pairing model to the electronic structure of monolayer NbSe2, where first-principles calculations reveal the presence of strong paramagnetic fluctuations. Our calculations provide a quantitative measure of the mixing between the even- and odd-parity superconducting states and its variation with Coulomb interaction. Further, numerical analysis in the presence of an external Zeeman field reveals the role of Ising spin-orbit coupling and mixing of odd-parity superconducting state in influencing the low-temperature enhancement of the critical magnetic field.
[1] S. Roy et al., 2D Mater. 12 015004 (2025).
Keywords: Ising Superconductivity; Unconventional Superconductivity; Spin- and Charge- fluctuation; Mixed Superconducting Instabilities; Magnetic field effect