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

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 ef...

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Veröffentlicht in:	Physica status solidi. C 2011-04, Vol.8 (4), p.1194-1197
Hauptverfasser:	Sun, Dong, Divin, Charles, Berger, Claire, de Heer, Walt A., First, Phillip N., Norris, Theodore B.
Format:	Artikel
Sprache:	eng
Schlagworte:	acoustic phonons Acoustics Cooling Cooling effects Epitaxy Graphene hot carrier cooling Phonons pump-probe spectroscopy Solid state physics Spectroscopy
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Zusammenfassung:	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)
ISSN:	1862-6351 1610-1642 1610-1642
DOI:	10.1002/pssc.201001134