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research article
Tunable Carrier Multiplication and Cooling in Graphene
2015
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. © 2014 American Chemical Society.
Type
research article
Web of Science ID
WOS:000348086100052
Authors
•
Ulstrup, Soren
•
•
Cilento, Federico
•
Zacchigna, Michele
•
Miwa, Jill A.
•
Cacho, Cephise
•
Chapman, Richard T.
•
Springate, Emma
•
Fromm, Felix
Publication date
2015
Publisher
Published in
Volume
15
Issue
1
Start page
326
End page
331
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
May 29, 2015
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