Superfluid weight and Berezinskii-Kosterlitz-Thouless transition temperature of twisted bilayer graphene
Aleksi Julku, Teemu J. Peltonen, Long Liang, Tero T. Heikkilä, Päivi Törmä
Abstract
Superconductivity in twisted bilayer graphene (TBG) has inspired fervent research to explain the origin of the phenomenon and to find whether moir\'e materials featuring flat bands offer a route to room-temperature superconductivity. Here, the authors show that TBG flat-band superconductivity relies on such quantum geometric properties of the band as its quantum metric and Berry curvature. The authors predict qualitative differences between different pairing potentials, which can be used to reveal the yet unknown pairing symmetry.
Topics & Concepts
Condensed matter physicsSuperfluidityKosterlitz–Thouless transitionGrapheneBilayer grapheneBilayerMaterials sciencePhysicsPhase transitionNanotechnologyChemistryMembraneBiochemistryQuantum and electron transport phenomenaQuantum Electrodynamics and Casimir EffectGraphene research and applications