Tunable Carrier Multiplication and Cooling in Graphene
Nano Letters2014Vol. 15(1), pp. 326–331
Citations Over TimeTop 10% of 2014 papers
J. Johannsen, Søren Ulstrup, A. Crepaldi, Federico Cilento, M. Zacchigna, Jill A. Miwa, Céphise Cacho, Richard T. Chapman, Emma Springate, Felix Fromm, Christian Raidel, Thomas Seyller, P. D. C. King, F. Parmigiani, M. Grioni, Philip Hofmann
Abstract
Time- and angle-resolved photoemission measurements on two doped graphene samples displaying different doping levels reveal remarkable differences in the ultrafast dynamics of the hot carriers in the Dirac cone. In the more strongly (n-)doped graphene, we observe larger carrier multiplication factors (>3) and a significantly faster phonon-mediated cooling of the carriers back to equilibrium compared to in the less (p-)doped graphene. These results suggest that a careful tuning of the doping level allows for an effective manipulation of graphene's dynamical response to a photoexcitation.
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