Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 29: Unconventional Superconductors
TT 29.9: Talk
Tuesday, March 10, 2026, 11:45–12:00, CHE/0091
Unconventional superconductivity in monolayer transition metal dichalcogenides — •Subhojit Roy1, Andreas Kreisel2, Brian Andersen3, and Shantanu Mukherjee4 — 1University of Regensburg, Regensburg, Germany — 2Niels Bohr Institute, University of Copenhagen, Denmark — 3Niels Bohr Institute, University of Copenhagen, Denmark — 4Indian Institute of Technology Madras, Chennai, India
The observation of a Leggett mode, nodal superconducting gaps in STM measurements, unusually large in-plane upper critical fields far exceeding the Pauli limit, and a two-fold gap anisotropy in magnetoresistance experiments all point toward an unconventional pairing mechanism.
Ab-initio calculations have further revealed a strongly anisotropic Eliashberg electron-phonon spectral function in monolayer NbSe2, with a significant contribution arising from same-spin K-K′ scattering.
In this work [1], we consider the interplay of electron-electron and electron-phonon interactions. Starting from the ab-initio phonon spectrum, we compute the effective phonon-mediated interaction and incorporate it into an RPA-based description of the screened Coulomb interaction. Our framework captures the full lattice structure, the multi-orbital character of the relevant d-band states, and phonon retardation effects within a unified microscopic model.
Using this model, we address key magnetic-field-dependent phenomena in Ising superconductors, including the enhanced Pauli limit and the two-fold magnetoresistance anisotropy.
[1] S. Roy et al., arXiv:2509.03907 (2025).
Keywords: Ising Superconductivity; Unconventional Superconductivity; Spin and charge fluctuations