Interlayer electron-hole friction in tunable twisted bilayer graphene semimetal
arXiv:2208.05659 · doi:10.1103/PhysRevLett.129.206802
Abstract
Charge-neutral conducting systems represent a class of materials with unusual properties governed by electron-hole (e-h) interactions. Depending on the quasiparticles' statistics, band structure, and device geometry these semimetallic phases of matter can feature unconventional responses to external fields that often defy simple interpretations in terms of single-particle physics. Here we show that small-angle twisted bilayer graphene (SA-TBG) offers a highly-tunable system in which to explore interactions-limited electron conduction. By employing a dual-gated device architecture we tune our devices from a non-degenerate charge-neutral Dirac fluid to a compensated two-component e-h Fermi liquid where spatially separated electrons and holes experience strong mutual friction. This friction is revealed through the T^2 resistivity that accurately follows the e-h drag theory we develop. Our results provide a textbook illustration of a smooth transition between different interaction-limited transport regimes and clarify the conduction mechanisms in charge-neutral SA-TBG.
arXiv comment11 pages, 4 figures, supplementary information
References in corpus (48)
- Moire bands in twisted double-layer graphene
- Micrometer-scale ballistic transport in encapsulated graphene at room temperature
- Bose-Einstein Condensation of Excitons in Bilayer Electron Systems
- Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene
- Tunable Moiré Bands and Strong Correlations in Small-Twist-Angle Bilayer Graphene
- Cleaning Interfaces in Layered Materials Heterostructures
- Why does the Quark-Gluon Plasma at RHIC behave as a nearly ideal fluid ?
- Strong Coulomb drag and broken symmetry in double-layer graphene
- Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
- Hydrodynamics of electrons in graphene
- Universal Quantum Viscosity in a Unitary Fermi Gas
- Quantum critical transport in clean graphene
- An exact continuum model for low-energy electronic states of twisted bilayer graphene
- Electrical and Thermal Transport at the Planckian Bound of Dissipation in the Hydrodynamic Electron Fluid of WP2
- Flavour Hund's Coupling, Correlated Chern Gaps, and Diffusivity in Moiré Flat Bands
- High Temperature Superfluidity in Double Bilayer Graphene
- Evidence for a Monolayer Excitonic Insulator
- Hydrodynamics in graphene: Linear-response transport
- Quantum Hall Effect, Screening and Layer-Polarized Insulating States in Twisted Bilayer Graphene
- Even denominator fractional quantum Hall states at an isospin transition in monolayer graphene
- Hydrodynamic model for electron-hole plasma in graphene
- Composite super-moiré lattices in double aligned graphene heterostructures
- Correlated interlayer exciton insulator in double layers of monolayer WSe2 and moiré WS2/WSe2
- Charge inversion and topological phase transition at a twist angle induced van Hove singularity of bilayer graphene
- Negative Coulomb Drag in Double Bilayer Graphene
- Violation of the Wiedemann-Franz law in clean graphene layers
- Magnetoresistance in two-component systems
- Giant magneto-drag in graphene at charge neutrality
- Electron-hole collision limited transport in charge-neutral bilayer graphene
- Correlated electron-hole State in Twisted Double Bilayer Graphene
- Out-of-equilibrium criticalities in graphene superlattices
- Microscopic theory for electron hydrodynamics in monolayer and bilayer graphene
- Coulomb drag in graphene near the Dirac point
- Universal linear and nonlinear electrodynamics of the Dirac fluid
- Out-of-plane dielectric susceptibility of graphene in twistronic and Bernal bilayers
- Coulomb Drag Mechanisms in Graphene
- Minibands in twisted bilayer graphene probed by magnetic focusing
- Observation of giant and tuneable thermal diffusivity of Dirac fluid at room temperature
- Dissipation-enabled hydrodynamic conductivity in a tunable bandgap semiconductor
- Lorentz ratio of a compensated metal
- Hall Drag and Magnetodrag in Graphene
- Combined minivalley and layer control in twisted double bilayer graphene
- Thermal transport in compensated semimetals: a mystery explained
- Pseudo-Euler equations from nonlinear optics: plasmon-assisted photodetection beyond hydrodynamics
- Strong interminivalley scattering in twisted bilayer graphene revealed by high-temperature magnetooscillations
- Transport in bilayer graphene near charge neutrality: Which scattering mechanisms are important?
- Electron-hole scattering limited transport of Dirac fermions in a topological insulator
- Dipole excitation of collective modes in viscous two-dimensional electron systems
Cited by in corpus (7)
- Anomalous terahertz photoconductivity caused by the superballistic flow of hydrodynamic electrons in graphene
- Extreme electron-hole drag and negative mobility in the Dirac plasma of graphene
- Interaction dominated transport in 2D conductors: from degenerate to partially-degenerate regime
- Interaction-controlled transport in a two-dimensional massless-massive Dirac system: Transition from degenerate to nondegenerate regimes
- Electron-hole collision-limited resistance of gapped graphene
- Interactions-controlled magnetotransport in two-dimensional massless-massive fermion mixtures
- Dragging of electric current by hydrodynamic flow at charge neutrality