Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 56: Superconductivity: Theory I
TT 56.13: Vortrag
Mittwoch, 11. März 2026, 18:15–18:30, CHE/0089
A universal route to chiral Ising superconductivity in monolayer TaS2 and NbSe2 — •Lucia Gibelli1, Simon Höcherl1, Julian Siegl1, Viliam Vano2, Somesh C.Ganguli2, Magdalena Marganska3, and Milena Grifoni1 — 1University of Regensburg, Germany — 2University of Aalto, Finland — 3University of Science and Technology, Wroclaw
Ising superconductivity in two archetypal intrinsic superconductors,
monolayer 1H-TaS2 and 1H-NbSe2, is investigated in a bottom-up approach [1].
Using ab initio-based tight-binding parameterizations for the relevant low-energy d-bands, the screened interaction is evaluated microscopically, in a scheme including Bloch overlaps.
In direct space, the screened potential displays for both systems long-range Friedel oscillations alternating in sign. Upon scaling, the oscillation pattern becomes universal, with the location of minima and maxima locked to the lattice.
Solving the momentum-resolved gap equations, a chiral ground state with p-like symmetry is generically found.
Due to the larger Ising spin-orbit coupling,
the chiral gap is more anisotropic in
TaS2 than in NbSe2. This is reflected in tunneling spectra displaying V-shaped features for the former, in quantitative agreement with low-temperature scanning tunneling experiments on TaS2. At the same time, our results reconcile the apparent discordance with hard gap tunneling spectra reported for the sibling NbSe2 [2]. They also agree with recent top-down calculations on the same material.
[1] L. Gibelli et al., arXiv:2509.05784 (2025)
[2] J. Siegl et al., Nature Communications, 16(1):8228 (2025)
Keywords: Ising Superconductivity; Unconventional superconductivity; Superconductivity in monolayer TMDCs