Tunable Carrier Multiplication and Cooling in Graphene

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.


Published in:
Nano Letters, 15, 1, 326-331
Year:
2015
Publisher:
Washington, Amer Chemical Soc
ISSN:
1530-6984
Keywords:
Laboratories:




 Record created 2015-05-29, last modified 2018-09-13


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)