Friedel oscillations and chiral superconductivity in monolayer NbSe2

Julian Siegl (), Anton Bleibaum, Wen Wan, Marcin Kurpas, John Schliemann, Miguel M. Ugeda, Magdalena Marganska and Milena Grifoni ()
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Julian Siegl: University of Regensburg
Anton Bleibaum: University of Regensburg
Wen Wan: Donostia International Physics Center
Marcin Kurpas: University of Silesia in Katowice
John Schliemann: University of Regensburg
Miguel M. Ugeda: Donostia International Physics Center
Magdalena Marganska: University of Regensburg
Milena Grifoni: University of Regensburg

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: 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 Tc two degenerate solutions of $${E}^{{\prime} }$$ E ′ 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 Tc is in good agreement with the spectral function extracted from tunnelling spectroscopy measurements.

Date: 2025
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DOI: 10.1038/s41467-025-63319-z

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