Electron-phonon coupling in suspended graphene: supercollisions by ripples

Abstract

Using electrical transport experiments and shot noise thermometry, we find strong evidence that "supercollision" scattering processes by flexural modes are the dominant electron-phonon energy transfer mechanism in high-quality, suspended graphene around room temperature. The power law dependence of the electron-phonon coupling changes from cubic to quintic with temperature. The change of the temperature exponent by two is reflected in the quadratic dependence on chemical potential, which is an inherent feature of two-phonon quantum processes.

11 + 4 pages, 2 + 3 figures

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• Unconventional fractional quantum Hall states and Wigner crystallization in suspended Corbino graphene
• Local noise in a diffusive conductor
• Electronic Cooling via Interlayer Coulomb Coupling in Multilayer Epitaxial Graphene
• Quantum and classical ripples in graphene
• Strain-dependent damping in nanomechanical resonators from thin $\mathrm{Mo}{\mathrm{S}}_2$ crystals
• Encapsulated Nanowires: Boosting Electronic Transport in Carbon Nanotubes
• Optimizing the photothermoelectric effect in graphene
• Probing charge and heat current noise by frequency-dependent temperature and potential fluctuations
• Light Induced Electron-Phonon Scattering Mediated Resistive Switching in Nanostructured Nb Thin Film Superconductor
• Spontaneous mass generation due to phonons in a two-dimensional Dirac fermion system
• Onset of optical-phonon cooling in multilayer graphene revealed by RF noise and black-body radiation thermometries
• Symmetry-breaking supercollisions in Landau-quantized graphene
• Thermal relaxation in titanium nanowires: signatures of inelastic electron-boundary scattering in heat transfer
• Composite fermions in graphene fractional quantum Hall state at half filling: evidence for Dirac composite fermions
• Temperature Dependent Zero-Field Splittings in Graphene
• Gyrotropic Zener tunneling and nonlinear IV curves in the zero-energy Landau level of graphene in a strong magnetic field
• Non-equilibrium properties of graphene probed by superconducting tunnel spectroscopy
• Dry transfer method for suspended graphene on lift-off-resist: simple ballistic devices with Fabry-Pérot interference
• Coherent Manipulation of Thermal Transport by Tunable Electron-Photon and Electron-Phonon Interaction
• Flexural phonons in supported graphene: from pinning to localization
• Sympathetic laser-cooling of graphene with Casimir-Polder forces
• Graphene resonator as an ultrasound detector for generalized Love waves in a polymer film with two level states
• The role of vector potential coupling in hot electron cooling power in bilayer graphene at low temperature
• Sub-Kelvin Lateral Thermal Transport in Diffusive Graphene
• Breakdown of zero-energy quantum Hall state in graphene in the light of current fluctuations and shot noise
• Active electron cooling of graphene