Work

Competition of Density Waves and Superconductivity in Twisted Tungsten Diselenide

Year: 2022

Type: article

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 (tWSe$_2$). We investigate their origin and interplay by using a functional renormalization group approach that allows to describe superconducting and spin/charge instabilities in an unbiased way. We map out the phase diagram as function of filling and perpendicular electric field, and find that the moiré Hubbard model for tWSe$_2$ 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 tWSe$_2$ beyond mean-field approximations and provides guidance for experimental measurements by outlining the fingerprint of correlated states in interacting susceptibilities.

Source: RWTH Publications (RWTH Aachen)

DOI: 10.48550/arxiv.2204.00648

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