Friedel oscillations and chiral superconductivity in monolayer NbSe₂.

Authors

Julian Siegl, Anton Bleibaum, Wen Wan, Marcin Kurpas, John Schliemann, Miguel M Ugeda, Magdalena Marganska, Milena Grifoni

Published in

Nature communications. Volume 16. Issue 1. Pages 8228. Sep 05, 2025. Epub Sep 05, 2025.

Abstract

The nature of the dominant pairing mechanism in some two-dimensional transition metal dichalcogenides is still debated. Focusing on monolayer 1H-NbSe₂, we show that superconductivity can be induced by the Coulomb interaction when accounting for screening effects on the trigonal lattice with multiple orbitals. Using ab initio based tight-binding parametrizations for the relevant low-energy d-bands, we evaluate the screened interaction microscopically. In the direct space, we find pronounced Friedel oscillations, a key to the Kohn-Luttinger mechanism for superconductivity. The momentum-resolved gap equations predict at the critical temperature T_c two degenerate solutions of $E^{\text{'}}$ symmetry, signalling the unconventional nature of the pairing. Their complex linear combination, i.e., a chiral gap with p-like symmetry, provides the ground state of the model. Our prediction of a fully gapped chiral phase well below T_c is in good agreement with the spectral function extracted from tunnelling spectroscopy measurements.

PMID:
40913051
Bibliographic data and abstract were imported from PubMed on 06 Sep 2025.

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