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Tunable Carrier Multiplication and Cooling in Graphene

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arxiv 1601.00702 v1 pith:PCZYD4AW submitted 2016-01-04 cond-mat.mtrl-sci cond-mat.mes-hall

Jens C. Johannsen , S{o}ren Ulstrup , Alberto Crepaldi , Federico Cilento , Michele Zacchigna , Jill A. Miwa , Cephise Cacho , Richard T. Chapman
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Emma Springate Felix Fromm Christian Raidel Thomas Seyller Phil D. C. King Fulvio Parmigiani Marco Grioni Philip Hofmann
This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.mes-hall
keywords graphenedopedcarriercarrierscoolingdopingmultiplicationallows
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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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