Competition of density waves and superconductivity in twisted tungsten diselenide

Evidence for correlated insulating and superconducting phases around regions of high density of states was reported in the strongly spin-orbit coupled van der Waals material twisted tungsten diselenide (tWSe2). We investigate their origin and interplay by using a functional renormalization group approach that allows one to describe superconducting and spin/charge instabilities in an unbiased way. We map out the phase diagram as a function of filling and perpendicular electric field, and find that the moire Hubbard model for tWSe2 features mixed-parity superconducting order parameters with s/ f -wave and topological d/p-wave symmetry next to (incommensurate) density-wave states. Our work systematically characterizes competing interaction-driven phases in tWSe2 beyond mean-field approximations and provides guidance for experimental measurements by outlining the fingerprint of correlated states in interacting susceptibilities.

Automated summary

Evidence of correlated insulating and superconducting phases in tWSe2 was reported. A functional renormalization group approach was used to investigate their origin and interplay. The phase diagram as a function of filling and perpendicular electric field was mapped, revealing mixed-parity superconducting order parameters with s/f-wave and topological d/p-wave symmetry.