Prominent Cooper pairing away from the Fermi level and its spectroscopic signature in twisted bilayer graphene
Fabian Schrodi, Alex Aperis, Peter M. Oppeneer
Abstract
The authors present the first multiband full-bandwidth Eliashberg calculations for twisted bilayer graphene and show that superconductivity arises primarily from Cooper pairing away from the Fermi level which enhances Tc, introduces particle-hole asymmetry and ensures a robust Meissner effect. Signatures of such Cooper pairing are predicted for future spectroscopic experiments. The results imply a paradigm shift in the theoretical treatment of superconductivity in flat-band systems, going beyond the conventional BCS picture to full- bandwidth Eliashberg theory
Topics & Concepts
PairingBilayer grapheneSuperconductivityPhysicsCondensed matter physicsSuperfluidityCooper pairFermi Gamma-ray Space TelescopeFermi levelQuantum tunnellingAngle-resolved photoemission spectroscopyPhotoemission spectroscopyDensity of statesPhase diagramGrapheneQuantum mechanicsElectronic structureSpectral linePhase (matter)ElectronGraphene research and applicationsQuantum and electron transport phenomenaPhysics of Superconductivity and Magnetism