Quantum criticality and superconductivity in twisted transition metal dichalcogenides
A. V. Chubukov, C. M. Varma
DOI 10.1103/PhysRevB.111.014507 · Physical Review B
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Abstract
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 K and K′ corner 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 ℓ=1 channels. 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 K−K′=2K and we estimate Tc using the form of the quantum-critical XY fluctuations, displaying ω/T scaling.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| WSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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