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Hot carrier cooling by acoustic phonons in epitaxial graphene by ultrafast pump-probe spectroscopy

By Dong Sun, Charles Divin, Claire Berger, Walt A. de Heer, Phillip N. First and Theodore B. Norris


We report the application nondegenerate ultrafast mid-infrared spectroscopy to investigate the acoustic phonon cooling process in epitaxial graphene. We show that the power-dependent experimental results match theoretical predictions of the low temperature acoustic cooling process. The hot phonon effect in acoustic phonon cooling is observed experimentally, and a deformation potential of 30 eV can be determined from fitting the data. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Publisher: WILEY-VCH Verlag
Year: 2011
DOI identifier: 10.1002/pssc.201001134
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