Quantum transport in flat bands and super-metallicity

Abstract

Quantum physics in flat-band (FB) systems embodies a variety of exotic phenomenon and even counter intuitive features. The quantum transport in several graphene based compounds that exhibit a flat band and a tunable gap is investigated. Despite the localized nature of the FB states and a zero group velocity, a super-metallic (SM) phase at the FB energy is revealed. The SM phase is robust against the inelastic scattering strength and controlled only by the inter-band transitions between the FB and the dispersive bands. The SM phase appears insensitive and quasi independent of the gap amplitude and nature of the lattice (disordered or nano-patterned). The universal nature of the unconventional FB transport is illustrated with the case of electrons in the Lieb lattice.

References in corpus (20)

• The electronic properties of graphene
• Many-Body Physics with Ultracold Gases
• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• High temperature fractional quantum Hall states
• Fractional quantum Hall states at zero magnetic field
• The Kernel Polynomial Method
• Nearly-flat bands with nontrivial topology
• Flat Bands in Slightly Twisted Bilayer Graphene
• Observation of a localized flat-band state in a photonic Lieb lattice
• Observation of bound states in Lieb photonic lattices
• Flat bands and Wigner crystallization in the honeycomb optical lattice
• Modeling disorder in graphene
• Numerical studies of confined states in rotated bilayers of graphene
• Topological Phases for Fermionic Cold Atoms on the Lieb Lattice
• The $p_{x,y}$-orbital counterpart of graphene: cold atoms in the honeycomb optical lattice
• Real-space calculation of the conductivity tensor for disordered topological matter
• Optical conductivity of a quantum electron gas in a Sierpinski carpet
• RKKY Interactions in Graphene: Dependence on Disorder and Gate Voltage
• Universal quantum transport and impurity band super metallicity in self-similar graphene carpets
• Carrier induced ferromagnetism in the insulating Mn doped III-V semiconductor InP

Cited by in corpus (11)

• Flat band induced room temperature ferromagnetism in two dimensional systems
• Vacancy-Engineered Flat-Band Superconductivity in Holey Graphene
• Giant boost of the quantum metric in disordered one dimensional flat band systems
• The multi-state geometry of shift current and polarization
• Optical conductivity of bilayer dice lattices
• Disorder-Induced Delocalization in Magic-Angle Twisted Bilayer Graphene
• Flat-band quantum communication induced by disorder
• Electronic transport properties and quantum localization effects monitored by selective functionalization in Bernal bilayer graphene
• Electronic structure and transport in materials with flat bands: 2D materials and quasicrystals
• Symmetry-enforced double Weyl points, multiband quantum geometry, and singular flat bands of doping-induced states at the Fermi level
• RKKY couplings in the Lieb lattice: flat-band induced frustration