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Ultrafast Dynamics of Highly Excited Dirac Fermions in Few-Layer Graphene: Evidence for Three-Particle Auger Scattering

Published online by Cambridge University Press:  31 January 2011

T Li ,
L Luo ,
M. Hupalo ,
M C Tringides  and
Jigang Wang
T Li
Affiliation:
fredltq@iastate.edu, Iowa State University, Department of Physics and Astronomy and Ames Laboratory, AMES, Iowa, United States
L Luo
Affiliation:
liangluo@iastate.edu, Iowa State University, Department of Physics and Astronomy and Ames Laboratory, AMES, Iowa, United States
M. Hupalo
Affiliation:
hupalo@ameslab.gov, Iowa State University, Department of Physics and Astronomy and Ames Laboratory, AMES, Iowa, United States
M C Tringides
Affiliation:
tringides@ameslab.gov, Iowa State University, Department of Physics and Astronomy and Ames Laboratory, AMES, Iowa, United States
Jigang Wang
Affiliation:
jwang@ameslab.gov, Iowa State University, Department of Physics and Astronomy and Ames Laboratory, AMES, Iowa, United States
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Abstract

We present femtosecond differential reflectivity studies of few-layer graphene from weak to strong excitation regime. Temporal profiles of the differential reflectivity exhibit strong non-exponential decay. A nonlinear, cubic root dependence of their peak amplitudes on the pump fluence is clearly observed under relatively high intensity excitation, which indicates three-particle decay of transient carrier population via Auger scattering. Our results identify the critical role of such three-particle scattering in the initial electronic relaxation in photo-excited graphene with increasing phase-space filling of the correlated Dirac Fermions.

Keywords

optoelectronicCoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1230: Symposium MM – Ultrafast Processes in Materials Science , 2009 , 1230-MM02-06
Copyright
Copyright © Materials Research Society 2010

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