Unconventional superconductivity due to interband polarization
Valentin Crépel, Tommaso Cea, Liang Fu, F. Guinea
Abstract
An important question about unconventional superconductors is how attractions can emerge in a purely repulsive electronic system. Here, the authors study comprehensively one such electronic mechanism, where pairing is induced by a third electron undergoing a virtual interband transition. Their exact solution of an illustrative Hubbard model establishes superconductivity due to interband polarization in both the weak and strong coupling regimes. Relevance of this pairing mechanism for twisted bilayer graphene is also discussed.
Topics & Concepts
PairingSuperconductivityCondensed matter physicsHubbard modelPhysicsPolarization (electrochemistry)Bilayer grapheneElectronQuantum mechanicsTheoretical physicsGrapheneChemistryPhysical chemistryPhysics of Superconductivity and MagnetismQuantum and electron transport phenomenaIron-based superconductors research