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Competition of density waves and superconductivity in twisted tungsten diselenide

MPS-Authors
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Kennes,  D. M.
Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA-Fundamentals of Future Information Technology;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;

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PhysRevResearch.5.L012034.pdf
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Citation

Klebl, L., Fischer, A., Classen, L., Scherer, M. M., & Kennes, D. M. (2023). Competition of density waves and superconductivity in twisted tungsten diselenide. Physical Review Research, 5(1): L012034. doi:10.1103/PhysRevResearch.5.L012034.


Cite as: https://hdl.handle.net/21.11116/0000-000A-3092-A
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.