Unconventional superconductivity due to interband polarization

Abstract

We analyze in detail the superconductivity that arises in an extended Hubbard model describing a multiband system with repulsive interactions. We show that virtual interband processes induce an effective attractive interaction for small momentum transfers, a situation not found in most models of superconductivity from repulsion. This attraction can be traced back, in real space, to the presence of correlated hopping terms induced by interband polarization. We reveal this physics with both strong-coupling expansion and many-body perturbation theory, supplemented by numerical calculations. Finally, we point out interesting similarities with the problem of interacting electrons in twisted bilayer graphene, suggesting the importance of interband contribution to superconductivity.

References in corpus (7)

• Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
• Superconductivity in rhombohedral trilayer graphene
• Superconductivity in the repulsive Hubbard model: an asymptotically exact weak-coupling solution
• Low-energy microscopic models for iron-based superconductors: a review
• Gate-controlled BCS-BEC crossover in a two-dimensional superconductor
• Band Structure and Superconductivity in Twisted Trilayer Graphene
• The Kohn-Luttinger effect and anomalous pairing in new superconducting systems and graphene

Cited by in corpus (27)

• Topological superconductivity in doped magnetic moiré semiconductors
• Enhanced superconductivity through virtual tunneling in Bernal bilayer graphene coupled to WSe${}_2$
• Nodal band-off-diagonal superconductivity in twisted graphene superlattices
• Superconductivity induced by the inter-valley Coulomb scattering in a few layers of graphene
• Band Renormalization, Quarter Metals, and Chiral Superconductivity in Rhombohedral Tetralayer Graphene
• Evolution of Superconductivity in Twisted Graphene Multilayers
• Anyon Superconductivity from Topological Criticality in a Hofstadter-Hubbard Model
• Bridging the small and large in twisted transition metal dicalcogenide homobilayers: a tight binding model capturing orbital interference and topology across a wide range of twist angles
• Interactions mediated by atoms, photons, electrons, and excitons
• Quantum many-body scars of spinless fermions with density-assisted hopping in higher dimensions
• Chiral model of twisted bilayer graphene realized in a monolayer
• Bipolaronic superconductivity out of a Coulomb gas
• Junctions and superconducting symmetry in twisted bilayer graphene
• Spinon pairing induced by chiral in-plane exchange and the stabilization of odd-spin Chern number spin liquid in twisted ${\mathrm{MoTe}}_2$
• Superconductivity induced by strong electron-exciton coupling in doped atomically thin semiconductor heterostructures
• Superconductivity of repulsive spinless fermions with sublattice potentials
• Attractive Haldane bilayers for trapping non-Abelian anyons
• Electronic Structure and Kohn-Luttinger Superconductivity of Heavily-Doped Single-Layer Graphene
• Twists and turns of superconductivity from a repulsive dynamical interaction
• Higher-order topological superconductivity in monolayer WTe${}_2$ from repulsive interactions
• Eliashberg Theory and Superfluid Stiffness of Band-Off-Diagonal Pairing in Twisted Graphene
• Boundary obstructed topological superconductor in buckled honeycomb lattice under perpendicular electric field
• Magnonic Superconductivity
• Mirror-protected Majorana zero modes in $f$-wave multilayer graphene superconductors
• Spectroscopic signature of spin triplet odd-valley superconductivity in two-dimensional materials
• Pairing around a Single Dirac Point: A Unifying View of Kohn-Luttinger Superconductivity in Chern Bands, Quarter Metals, and Topological Surface States
• Floquet engineering of effective pairing interactions in a doped band insulator