Competition of Density Waves and Superconductivity in Twisted Tungsten Diselenide

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.

7 pages, 3 figures, supplemental material

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• Theory of Correlated Insulators and Superconductor at $\nu =1$ in Twisted WSe${}_2$
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• Twist-angle evolution of the intervalley-coherent antiferromagnet in twisted WSe${}_2$
• Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$
• Theory of intervalley-coherent AFM order and topological superconductivity in tWSe${}_2$
• Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4
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• Moiré Band Engineering in Twisted Trilayer WSe2
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• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Angle evolution of the superconducting phase diagram in twisted bilayer WSe2
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• In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe${}_2$ homobilayers
• Dirac quantum criticality in twisted double bilayer transition metal dichalcogenides
• Kekulé order from diffuse nesting near higher-order Van Hove points
• Site-polarized Mott phases competing with a correlated metal in twisted WSe${}_2$
• Surface Functional Renormalization Group for Layered Quantum Materials