2010/02/28 by J. K. Viljas, Tero T. Heikkilä, T. T. Heikkilä · 13 citations
Engineering · Materials Science · Physics and Astronomy · #Graphene research and applications #Thermal Radiation and Cooling Technologies #Thermal properties of materials #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.81.245404
published as Phys. Rev. B 81, 245404 (2010) · 13 pages, 8 figures; moved details to appendixes, added discussion of remote phonons
arxiv created 2010/04/26 · openalex publication_date 2010/06/01 · arxiv updated 2010/06/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We calculate the heat transfer between electrons to acoustic and optical phonons in monolayer and bilayer graphene (MLG and BLG) within the quasiequilibrium approximation. For acoustic phonons, we show how the temperature-power laws of the electron-phonon heat current for BLG differ from those previously derived for MLG and note that the high-temperature (neutral-regime) power laws for MLG and BLG are also different, with a weaker dependence on the electronic temperature in the latter. In the general case we evaluate the heat current numerically. We suggest that a measurement of the heat current could be used for an experimental determination of the electron-acoustic-phonon coupling constants, which are not accurately known. However, in a typical experiment heat dissipation by electrons at very low temperatures is dominated by diffusion and we estimate the crossover temperature at which acoustic-phonon coupling takes over in a sample with Joule heating. At even higher temperatures optical phonons begin to dominate. We study some examples of potentially relevant types of optical modes, including, in particular, the intrinsic in-plane modes and additionally the remote surface phonons of a possible dielectric substrate.