Competition of density waves and superconductivity in twisted tungsten diselenide

Lennart Klebl; Ammon Fischer; Laura Classen; Michael M. Scherer; Dante M. Kennes

doi:10.1103/PhysRevResearch.5.L012034

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Competition of density waves and superconductivity in twisted tungsten diselenide

Lennart Klebl, Ammon Fischer, Laura Classen, Michael M. Scherer, Dante M. Kennes

DOI 10.1103/PhysRevResearch.5.L012034 · Physical Review Research

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Abstract

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 moiré 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.