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  • Letter
  • Open Access

Competition of density waves and superconductivity in twisted tungsten diselenide

Lennart Klebl1, Ammon Fischer1, Laura Classen2, Michael M. Scherer3, and Dante M. Kennes1,4

  • 1Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA-Fundamentals of Future Information Technology, D-52056 Aachen, Germany
  • 2Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
  • 3Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany
  • 4Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, D-22761 Hamburg, Germany

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Phys. Rev. Research 5, L012034 – Published 10 March, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L012034

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.

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Phys. Rev. Research 5, L012034– Published 10 March, 2023
  • Received 4 April 2022
  • Accepted 27 February 2023
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