Disorder-Assisted Electron-Phonon Scattering and Cooling Pathways in Graphene

Abstract

We predict that graphene is a unique system where disorder-assisted scattering (supercollisions) dominates electron-lattice cooling over a wide range of temperatures, up to room temperature. This is so because for momentum-conserving electron-phonon scattering the energy transfer per collision is severely constrained due to a small Fermi surface size. The characteristic $T^3$ temperature dependence and power-law cooling dynamics provide clear experimental signatures of this new cooling mechanism. The cooling rate can be changed by orders of magnitude by varying the amount of disorder which offers means for a variety of new applications that rely on hot-carrier transport.

4 pgs, 2 fgs

References in corpus (8)

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• Dual-gated bilayer graphene hot electron bolometer
• Substrate limited electron dynamics in graphene
• Limits on electron quality in suspended graphene due to flexural phonons
• Electron-phonon heat transfer in monolayer and bilayer graphene
• Very Slow Cooling Dynamics of Photoexcited Carriers in Graphene Observed by Optical-Pump Terahertz-Probe Spectroscopy
• Temperature dependent resistivity in bilayer graphene due to flexural phonons
• Non-linear resistivity and heat dissipation in monolayer graphene

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