Chiral second-sound collective mode at the edge of 2D systems with nontrivial Berry curvature
arXiv:1701.02310 · doi:10.1103/PhysRevLett.118.036802
Abstract
We study the thermal transport in two-dimensional systems with a nontrivial Berry curvature texture. The physical realizations are many: for a sake of definiteness we consider undoped graphene gapped by the presence of an aligned hexagonal-Boron-Nitride substrate. The same phenomenology applies, i.e., to surface states of 3D topological insulators in the presence of a uniform magnetization. We find that chiral valley-polarized second-sound collective modes propagate along the edges of the system. The localization length of the edge modes has topological origin stemming from the anomalous velocity term in the quasiparticle current. At low temperature, the single-particle contribution to the transverse thermal conductance is exponentially suppressed and only second-sound modes carry heat along the boundary. A sharp change in the behavior of the thermal Hall conductance, extracted from nonlocal measurements of the temperature along the edge, marks the onset of ballistic heat transport due to second-sound edge modes.
arXiv comment6 pages, 3 figures
References in corpus (44)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Two Dimensional Atomic Crystals
- Thermal Properties of Graphene, Carbon Nanotubes and Nanostructured Carbon Materials
- Berry Phase Effects on Electronic Properties
- Electronic transport in two dimensional graphene
- Graphene plasmonics
- Valley contrasting physics in graphene: magnetic moment and topological transport
- Hofstadter's butterfly in moire superlattices: A fractal quantum Hall effect
- Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure
- Cloning of Dirac fermions in graphene superlattices
- Electron-Electron Interactions in Graphene: Current Status and Perspectives
- Emergence of Superlattice Dirac Points in Graphene on Hexagonal Boron Nitride
- Valley Dependent Optoelectronics from Inversion Symmetry Breaking
- Electronic Properties of Graphene in a Strong Magnetic Field
- Commensurate-incommensurate transition for graphene on hexagonal boron nitride
- Berry Curvature on the Fermi Surface: Anomalous Hall Effect as a Topological Fermi-Liquid Property
- Detecting Topological Currents in Graphene Superlattices
- Negative local resistance caused by viscous electron backflow in graphene
- Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene
- Berry phase effect in anomalous thermoelectric transport
- Berry Curvature, Triangle Anomalies, and the Chiral Magnetic Effect in Fermi Liquids
- Thermal conductivity of suspended pristine graphene measured by Raman spectroscopy
- Non-local transport and the hydrodynamic shear viscosity in graphene
- Observation of neutral modes in the fractional quantum Hall regime
- Energy Magnetization and Thermal Hall Effect
- Hydrodynamic description of transport in strongly correlated electron systems
- Semiclassical theory of spin transport in spin-orbit coupled systems
- Hydrodynamics in graphene: Linear-response transport
- Bulk and shear viscosities of the 2D electron liquid in a doped graphene sheet
- Chiral plasmons without magnetic field
- Collision-dominated nonlinear hydrodynamics in graphene
- Observation of Chiral Heat Transport in the Quantum Hall Regime
- Band gaps in incommensurable graphene on hexagonal boron nitride
- Effect of structural relaxation on the electronic structure of graphene on hexagonal boron nitride
- Violation of the Wiedemann-Franz law in clean graphene layers
- Interaction corrections to the thermal transport coefficients in disordered metals: quantum kinetic equation approach
- Helicons in Weyl semimetals
- Metal-Insulator Transition in Graphene on Boron Nitride
- Electronic thermal conductivity of disordered metals
- Quasiclassical theory of charge transport in disordered interacting electron systems
- The intrinsic charge and spin conductivities of doped graphene in the Fermi-Liquid regime
- Landau theory of helical Fermi liquids
- Theory of Thermal Conductivity in the Disordered Electron Liquid