2024/10/13 by A. V. Chubukov, C. M. Varma, Chubukov, A. V. +1 · 5 citations
Chemistry · Materials Science · #FOS: Physical sciences #Inorganic Chemistry and Materials #Iron-based superconductors research #Organic and Molecular Conductors Research #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2410.10038
openalex publication_date 2024/10/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze a model for electronic structure and interactions in twisted transition metal chalcogenide WSe2 for superconductivity. In this material, spin-orbit scattering locks the z-components of spins of low-energy fermions near the Dirac \bf K and \bf K' points of the hexagonal Brillouin zone, reducing the symmetry of spin-spin interactions to that of an xy model. We show that a nominally repulsive 4-fermion interaction gives rise to an attraction for pairing in a two-component E- channel, which is a hexagonal lattice representation of the ℓ =1 channel. The gap function is inversion-odd and a linear combination of spin singlet and spin triplet. At weak coupling superconductivity emerges via the Kohn-Luttinger mechanism; we compute Tc for the Fermi-level lying close to the van Hove singularity. At strong coupling, the pairing is mediated by XY magnetic fluctuations peaked at momenta \bf K-\bf K' = 2 \bf K and we estimate Tc using the form of the quantum-critical XY fluctuations, displaying ω/T scaling.