Quantum geometry induced microwave enhancement of flat band superconductivity
arXiv:2411.03437 · doi:10.1038/s42005-025-02244-5
Abstract
Photo-control of correlated phases is central to advancing and manipulating novel functional properties of quantum materials. Here, we explore microwave enhancement of superconductivity in flat bands through generation of nonequilibrium quasiparticles at subgap frequencies. In conventional superconductors, it is known to occur via radiation absorption determined by fermi velocity, which however is small in flat bands resulting in quenched quasiparticle excitations. Strikingly, in contrast to the conventional paradigm we show a non-vanishing microwave absorption in flat band systems enabled by Bloch quantum geometry leading to superconducting gap enhancement, underscoring the band-geometric origin of nonequilibrium flat band superconductivity. Specifically, we demonstrate this in twisted bilayer graphene, a promising candidate material, and find significant gap enhancement near critical temperature. This work highlights that the nonequilibrium dynamics of materials with non-trivial flat bands as a promising area for future experimental and theoretical investigation.
References in corpus (21)
- Lattice relaxation and energy band modulation in twisted bilayer graphenes
- Superconductivity in rhombohedral trilayer graphene
- Superfluidity and Quantum Geometry in Twisted Multilayer Systems
- Theory of microwave-induced oscillations in the magnetoconductivity of a 2D electron gas
- Band structure and insulating states driven by the Coulomb interaction in twisted bilayer graphene
- Superconductivity and quantized anomalous Hall in rhombohedral graphene
- Optical Spectral Weight, Phase Stiffness and Tc Bounds for Trivial and Topological Flat Band Superconductors
- Strong Inter-valley Electron-Phonon Coupling in Magic-Angle Twisted Bilayer Graphene
- The Ginzburg-Landau theory of flat band superconductors with quantum metric
- Diamagnetic response and phase stiffness for interacting isolated narrow bands
- Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene
- Strain-induced large injection current in twisted bilayer graphene
- Effect of Quasiparticles Injection on the AC Response of a Superconductor
- Quantum plasmonic non-reciprocity in parity-violating magnets
- Cavity engineered phonon-mediated superconductivity in MgB from first principles quantum electrodynamics
- Suppression of non-equilibrium quasiparticle transport in flat band superconductors
- Upper bounds on superconducting and excitonic phase-stiffness for interacting isolated narrow bands
- Nonlinear Response of Diffusive Superconductors to -electromagnetic Fields
- Circuit QED detection of induced two-fold anisotropic pairing in a hybrid superconductor-ferromagnet bilayer
- Fractional microwave-induced resistance oscillations
- Ephemeral Superconductivity Atop the False Vacuum