Insulator-pseudogap crossover in the Lieb lattice
arXiv:2007.05118 · doi:10.1103/PhysRevB.103.L220502
Abstract
We study the attractive Hubbard model in the Lieb lattice to understand the normal state above the superconducting critical temperature in a flat band system. We use cluster dynamical mean-field theory to compute the two-particle susceptibilities with full quantum fluctuations included in the cluster. At interaction strengths lower than the hopping amplitude, we find that the normal state on the flat band is an insulator. The insulating behavior stems from the localization properties of the flat band. A flat-band enhanced pseudogap with a depleted spectral function arises at larger interactions.
arXiv comment6 pages, 4 figures and a supplementary material
References in corpus (55)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Correlated Electrons in High Temperature Superconductors
- Tuning superconductivity in twisted bilayer graphene
- Continuous-time Monte Carlo methods for quantum impurity models
- Quantum Cluster Theories
- Charge-Order and Broken Rotational Symmetry in Magic Angle Twisted Bilayer Graphene
- Observation of a localized flat-band state in a photonic Lieb lattice
- Superfluidity in topologically nontrivial flat bands
- High-temperature surface superconductivity in topological flat-band systems
- Cascade of electronic transitions in magic-angle twisted bilayer graphene
- Cascade of Phase Transitions and Dirac Revivals in Magic Angle Graphene
- Experimental realization and characterization of an electronic Lieb lattice
- Ferromagnetism in the Hubbard Model-- Examples from Models with Degenerate Single-Electron Ground States
- Coherent driving and freezing of bosonic matter wave in an optical Lieb lattice
- Geometric origin of superfluidity in the Lieb lattice flat band
- Topological states in engineered atomic lattices
- Superconductivity and the Pseudogap in the two-dimensional Hubbard model
- Observation of pseudogap behavior in a strongly interacting Fermi gas
- Flat bands in topological media
- Band geometry, Berry curvature and superfluid weight
- Topology-Bounded Superfluid Weight In Twisted Bilayer Graphene
- Observation of a pairing pseudogap in a two-dimensional Fermi gas
- Superfluid weight and Berezinskii-Kosterlitz-Thouless transition temperature of twisted bilayer graphene
- Deviations from Fermi-liquid behavior above in 2D short coherence length superconductors
- Geometric and conventional contribution to superfluid weight in twisted bilayer graphene
- Local Electronic Correlation at the Two-Particle Level
- Quantum metric and effective mass of a two-body bound state in a flat band
- Fragile topology and flat-band superconductivity in the strong-coupling regime
- Effective theory and emergent symmetry in the flat bands of attractive Hubbard models
- Dynamical mean-field theory for pairing and spin gap in the attractive Hubbard model
- Diagrammatic Determinantal methods: projective schemes and applications to the Hubbard-Holstein model
- Realization of Lieb Lattice in Covalent-organic Frameworks with Tunable Topology and Magnetism
- Superconducting Transitions in Flat Band Systems
- Preformed pairs in flat Bloch bands
- Momentum-sector-selective metal-insulator transition in the eight-site dynamical mean-field approximation to the Hubbard model in two dimensions
- Pairing and Superconductivity from weak to strong coupling in the Attractive Hubbard model
- Topological phase transitions in the repulsively interacting Haldane-Hubbard model
- Upper bounds on the superfluid stiffness and superconducting : Applications to twisted-bilayer graphene and ultra-cold Fermi gases
- First-Order Pairing Transition and Single-Particle Spectral Function in the Attractive Hubbard Model
- Quantum Metallicity on the High-Field Side of the Superconductor-Insulator Transition
- Superconductivity, pseudogap, and phase separation in topological flat bands: a quantum Monte Carlo study
- Phase diagram of pyrochlore iridates: all-in-all-out magnetic ordering and non-Fermi liquid properties
- Superconducting Fluctuations in the Normal State of the Two-Dimensional Hubbard Model
- Local origin of the pseudogap in the attractive Hubbard model
- Doping Controlled Superconductor-Insulator Transition in Bi2Sr2-xLaxCaCu2O8+delta
- Phase diagram topology of the Haldane-Hubbard-Coulomb model
- Pairing and non-Fermi liquid behavior in partially flat-band systems
- Exact solutions for the periodic Anderson model in 2D: A Non-Fermi liquid state in normal phase
- Exact diagonalization of the Hubbard model on graphics processing units
- Strain induced superconductor-insulator transition on Lieb lattice
- Enhanced correlations and superconductivity in weakly interacting partially flat band systems: a determinantal quantum Monte Carlo study
- Flat band induced non-Fermi liquid behavior of multicomponent fermions
- Magnetization, d-wave superconductivity and non-Fermi liquid behavior in a crossover from dispersive to flat bands
- Continuous and reversible tuning of the disorder-driven superconductor-insulator transition in bilayer graphene