Emergent Relativistic Effects in Condensed Matter
From Fundamental Aspects to Electronic Functionality
From Fundamental Aspects to Electronic Functionality
Nature Communications 16, 8228 (2025)
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’ 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.
Friedel oscillations and chiral superconductivity in monolayer NbSe2 | Nature Communications
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Doris Meier
Universität Regensburg
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