Topological Chiral Superconductivity Mediated by Intervalley Antiferromagnetic Fluctuations in Twisted Bilayer WSe${}_2$

Abstract

Motivated by the recent observations of superconductivity in twisted bilayer WSe${}_2$ (tWSe${}_2$), we theoretically investigate the superconductivity driven by electronic mechanism. We first demonstrate that the multi-band screened Coulomb interaction within the random phase approximation is insufficient to induce observable pairing instability. Nevertheless, by further including the intervalley antiferromagnetic fluctuations, the pairing interaction is substantially enhanced, yielding superconductivity with critical temperature $T_c$ of hundreds of millikelvin at van Hove singularities. The predicted $T_c$ increases with increasing the displacement field and corresponds to a doubly-degenerate $d$-wave-like pairing, which evolves into topological chiral $d\pm id$ superconductor below $T_c$. The interplay between superconductivity and intervalley antiferromagnetism results in a phase diagram consistent with experimental observations.These findings establish intervalley fluctuations as the primary pairing glue in tWSe${}_2$.

7+14 pages, 5+11 figures

References in corpus (38)

• Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
• Signatures of Fractional Quantum Anomalous Hall States in Twisted MoTe2 Bilayer
• Observation of Fractionally Quantized Anomalous Hall Effect
• Quantum anomalous Hall effect from intertwined moiré bands
• Integer and fractional Chern insulators in twisted bilayer MoTe2
• Electric field tunable unconventional superconductivity in alternating twist magic-angle trilayer graphene
• Observation of integer and fractional quantum anomalous Hall effects in twisted bilayer MoTe2
• Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3
• Quantum critical behavior in magic-angle twisted bilayer graphene
• Superconductivity in twisted bilayer WSe${}_2$
• Competing zero-field Chern insulators in Superconducting Twisted Bilayer Graphene
• Programming Correlated Magnetic States via Gate Controlled Moiré Geometry
• Tunable bilayer Hubbard model physics in twisted WSe2
• Gate-tunable heavy fermions in a moiré Kondo lattice
• Mapping twist-tuned multiband topology in bilayer WSe${}_2$
• Coulomb interaction, phonons, and superconductivity in twisted bilayer graphene
• Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene
• Superconductivity from Repulsive Interactions in Rhombohedral Trilayer Graphene: a Kohn-Luttinger-Like Mechanism
• Pair-density-wave and chiral superconductivity in twisted bilayer transition-metal-dichalcogenides
• Interaction-driven topological phase diagram of twisted bilayer MoTe${}_2$
• Topological superconductivity in doped magnetic moiré semiconductors
• Spin-valley density wave in moiré materials
• Functional Renormalization Group Study of Superconductivity in Rhombohedral Trilayer Graphene
• Spin-valley locked instabilities in moire transition metal dichalcogenides with conventional and higher-order Van Hove singularities
• Superconductivity in the twisted bilayer transition metal dichalcogenide WSe${}_2$ : a quantum cluster study
• Superconductivity in twisted transition metal dichalcogenide homobilayers
• Evolution of Superconductivity in Twisted Graphene Multilayers
• Mixed singlet-triplet superconducting state within the moiré $t$-$J$-$U$ model as applied to the description of twisted WSe${}_2$ bilayer
• Theory of Correlated Insulators and Superconductor at $\nu =1$ in Twisted WSe${}_2$
• Electrically tuned topology and magnetism in twisted bilayer MoTe${}_2$ at ${\nu }_h=1$
• Nematic, chiral and topological superconductivity in transition metal dichalcogenides
• Topological superconductivity with mixed singlet-triplet pairing in moiré transition-metal-dichalcogenide bilayers
• Twist-angle evolution of the intervalley-coherent antiferromagnet in twisted WSe${}_2$
• Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$
• Triplet superconductivity and spin density wave in biased AB bilayer graphene
• Approximate symmetries, insulators, and superconductivity in continuum-model description of twisted WSe${}_2$
• Superconductivity and spin density wave in AA stacked bilayer graphene
• Coexistence of nematic superconductivity and spin density wave in magic-angle twisted bilayer graphene

Cited by in corpus (5)

• Angle evolution of the superconducting phase diagram in twisted bilayer WSe2
• Quantum Phases in Twisted Homobilayer Transition Metal Dichalcogenides
• Pathways from a chiral superconductor to a composite Fermi liquid
• Site-polarized Mott phases competing with a correlated metal in twisted WSe${}_2$
• Stripe antiferromagnetism and chiral superconductivity in tWSe${}_2$