Universal route to chiral Ising superconductivity in monolayer TaS 2 and NbSe 2

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2025-12-29

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Department of Applied Physics

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en

Pages

7

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Physical Review B, Volume 112, issue 22, pp. 1-7

Abstract

We investigate Ising superconductivity in two archetypal intrinsic superconductors, monolayer 1⁢−TaS2 and 1⁢−NbSe2, in a bottom-up approach. Using ab initio-based tight-binding parametrizations for the relevant low-energy 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 -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.

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DOI

10.1103/bh1n-sc95

Citation

Gibelli, L, Höcherl, S, Siegl, J, Vano, V, Ganguli, S C, Marganska, M & Grifoni, M 2025, 'Universal route to chiral Ising superconductivity in monolayer TaS 2 and NbSe 2', Physical Review B, vol. 112, no. 22, L220505, pp. 1-7. https://doi.org/10.1103/bh1n-sc95

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https://urn.fi/URN:NBN:fi:aalto-202601021009

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[article-cris] Perustieteiden korkeakoulu / SCI