Carrier lifetime in exfoliated few-layer graphene determined from intersubband optical transitions

T. Limmer, J. Feldmann, E. Da Como

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We report a femtosecond transient spectroscopy study in the near to middle infrared range, 0.8-0.35 eV photon energy, on graphene and few layer graphene single flakes. The spectra show an evolving structure of photoinduced absorption bands superimposed on the bleaching caused by Pauli blocking of the interband optically coupled states. Supported by tight-binding model calculations, we assign the photoinduced absorption features to intersubband transitions as the number of layers is increased. Interestingly, the intersubband photoinduced resonances show a longer dynamics than the interband bleaching, because of their independence from the absolute energy of the carriers with respect to the Dirac point. The dynamic of these intersubband transitions reflects the lifetime of the hot carriers and provides an elegant method to access it in this important class of semimetals.
Original languageEnglish
Article number217406
Number of pages5
JournalPhysical Review Letters
Issue number21
Early online date23 May 2013
Publication statusPublished - 24 May 2013


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