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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.1: Poster
Montag, 17. März 2025, 15:00–18:00, P4
Chiral and nematic superconductivity in monolayer NbSe2 — •Anton Bleibaum1, Julian Siegl1, Wen Wan2, Marcin Kurpas3, John Schliemann1, Miguel M. Ugeda2,4,5, Magdalena Marganska1, and Milena Grifoni1 — 1Institute for Theoretical Physics, University of Regensburg, 93053 Regensburg, Germany — 2Donostia International Physics Center, Paseo Manuel de Lardizábal 4, 20018 San Sebastián, Spain — 3Institute of Physics, University of Silesia in Katowice, 41-500 Chorzów, Poland — 4Centro de Física de Materiales, Paseo Manuel de Lardizábal 5, 20018 San Sebastián, Spain — 5Ikerbasque, Basque Foundation for Science, Bilbao 48013, Spain
Superconductivity emerges when there is an effective attractive electron-electron interaction. As proposed by Kohn and Luttinger in 1965, screening of the Coulomb interaction can give rise to long-range Friedel oscillations providing regions of attractive interaction which allow for Cooper pairing. In NbSe2, Coulomb repulsion is sufficient to induce superconductivity, when accounting for screening on the triangular lattice. Using momentum resolved gap equations, we find two quasi-degenerate nematic solutions near the critical temperature Tc. In agreement with tunneling spectroscopy experiments, a complex linear combination forms a fully gaped chiral phase well below Tc. When we allow for an in-plane magnetic field, we find an equal spin pairing component.
Keywords: NbSe; chiral; Friedel oszillations; momentum resolved gap equation; tunneling spectroscopy