Gibelli, Lucia and Höcherl, Simon and Siegl, Julian and Vano, Viliam and Ganguli, Somesh C. and Marganska, Magdalena and Grifoni, Milena (2025) Universal route to chiral Ising superconductivity in monolayer TaS2 and NbSe2. PHYSICAL REVIEW B, 112 (22): L220505. ISSN 2469-9950, 2469-9969
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We investigate Ising superconductivity in two archetypal intrinsic superconductors, monolayer 1H-TaS2 and 1H-NbSe2, in a bottom-up approach. Using ab initio-based tight-binding parametrizations 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 for both systems displays 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2026 08:30 |
| Last Modified: | 15 Jul 2026 08:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66497 |
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