Nematic, chiral, and topological superconductivity in twisted transition metal dichalcogenides

Constantin Schrade; Liang Fu

doi:10.1103/PhysRevB.110.035143

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Nematic, chiral, and topological superconductivity in twisted transition metal dichalcogenides

Constantin Schrade, Liang Fu

DOI 10.1103/PhysRevB.110.035143 · Physical Review B

T1

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Abstract

We introduce and study a realistic model for superconductivity in twisted bilayer WSe2, where electron pairing arises from spin-valley fluctuations in the weak-coupling regime. Our model comprises both the full continuum model moiré band structure and a short-ranged repulsive interaction. By calculating the spin-valley susceptibility, we identify a significant enhancement of the spin-valley fluctuations near half filling of the topmost moiré band. We then analyze the dominant Kohn-Luttinger pairing instabilities due to these spin-valley fluctuations and show that the leading instability corresponds to a two-component order parameter, which can give rise to nematic, chiral, and topological superconductivity. As our findings are asymptotically exact for small interaction strengths, they provide a viable starting point for future studies of superconductivity in twisted transition metal dichalcogenide bilayers.

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