Nematic, chiral and topological superconductivity in transition metal dichalcogenides

Abstract

We introduce and study a realistic model for superconductivity in twisted bilayer WSe${}_2$, where electron pairing arises from spin-valley fluctuations in the weak-coupling regime. Our model comprises both the full continuum model moiré bandstructure and a short-ranged repulsive interaction. By calculating the spin-valley susceptibility, we identify a Fermi surface nesting feature near half-filling of the top-most moiré band, which induces significantly enhanced spin-valley fluctuations. We then analyze the dominant Kohn-Luttinger pairing instabilities due to these spin-valley fluctuations and show that the leading instability corresponds to a two-component order parameter, which can give rise to nematic, chiral and topological superconductivity. As our findings are asymptotically exact for small interaction strengths, they provide a viable starting point for future studies of superconductivity in twisted transition metal dichalcogenide bilayers.

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Cited by in corpus (15)

• Superconductivity in twisted bilayer WSe${}_2$
• Superconductivity in twisted WSe${}_2$ from topology-induced quantum fluctuations
• Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$
• Twist-angle evolution of the intervalley-coherent antiferromagnet in twisted WSe${}_2$
• Theory of intervalley-coherent AFM order and topological superconductivity in tWSe${}_2$
• Approximate symmetries, insulators, and superconductivity in continuum-model description of twisted WSe${}_2$
• Topological Chiral Superconductivity Mediated by Intervalley Antiferromagnetic Fluctuations in Twisted Bilayer WSe${}_2$
• Intrinsic superconducting diode effect and nonreciprocal superconductivity in rhombohedral graphene multilayers
• Moiré Band Engineering in Twisted Trilayer WSe2
• Chiral superconductivity from spin polarized Chern band in twisted MoTe${}_2$
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe${}_2$ homobilayers
• Site-polarized Mott phases competing with a correlated metal in twisted WSe${}_2$
• Propagating Collective Spin-valley Modes in Twisted WSe2
• Onset of spin-valley order and Stoner boundaries in twisted WSe${}_2$