Energy relaxation in graphene and its measurement with supercurrent

Abstract

We study inelastic energy relaxation in graphene for low energies to find out how electrons scatter with acoustic phonons and other electrons. By coupling the graphene to superconductors, we create a strong dependence of the measured signal, i.e.,\ critical Josephson current, on the electron population on different energy states. Since the relative population of high- and low-energy states is determined by the inelastic scattering processes, the critical current becomes an effective probe for their strength. We argue that the electron-electron interaction is the dominant relaxation method and, in our model of two-dimensional electron-electron scattering, we find a scattering time ${\tau }_{e-e}=\mathrm{5...13}$ ps at T=500 mK, 1-2 orders of magnitude smaller than predicted by theory.

10 pages, 13 figures submitted to Physical Review B

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• The electronic properties of graphene
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• Phonon bottleneck in graphene-based Josephson junctions at millikelvin temperatures
• Performance of Graphene Thermal Photon Detectors
• Electron-phonon cooling in large monolayer graphene devices
• Contact doping, Klein tunneling, and asymmetry of shot noise in suspended graphene
• Heat switch and thermoelectric effects based on Cooper-pair splitting and elastic cotunneling
• Phase-dependent microwave response of a graphene Josephson junction
• Prospective performance of graphene HEB for ultrasensitive detection of sub-mm radiation
• Entropy current and efficiency of quantum machines driven by nonequilibrium incoherent reservoirs
• Measurement of the electronic thermal conductance channels and heat capacity of graphene at low temperature
• Energy transport via multiphonon processes in graphene
• Joule heating effects in high transparency Josephson junctions
• Monolayer graphene bolometer as a sensitive far-IR detector
• Sub-Kelvin Lateral Thermal Transport in Diffusive Graphene
• Nonequilibrium distribution functions in electron transport: Decoherence, energy redistribution and dissipation
• Graphene-based Bolometers
• Hanbury Brown and Twiss Exchange Correlations in Graphene Box