Influence of carrier density on the electronic cooling channels of bilayer graphene

T. Limmer, A. J. Houtepen, A. Niggebaum, R. Tautz, E. Da Como

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We study the electronic cooling dynamics in a single flake of bilayer graphene by femtosecond transient absorption probing the photon-energy range 0.25–1.3 eV. From the transients, we extract the carrier cooling curves for different initial temperatures and densities of the photoexcited electrons and holes. Two regimes of carrier cooling, dominated by optical and acoustic phonons emission, are clearly identified. For increasing carrier density, the crossover between the two regimes occurs at larger carrier temperatures, since cooling via optical phonons experiences a bottleneck. Acoustic phonons, which are less sensitive to saturation, show an increasing contribution at high density.
Original languageEnglish
Article number103104
JournalApplied Physics Letters
Volume99
Issue number10
DOIs
Publication statusPublished - Sep 2011

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