Title
Photo-excited carriers and optical conductance and transmission in graphene in the presence of phonon scattering Photo-excited carriers and optical conductance and transmission in graphene in the presence of phonon scattering
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam :North-Holland ,
Subject
Physics
Engineering sciences. Technology
Source (journal)
Physica. E: Low-dimensional systems and nanostructures. - Amsterdam
Volume/pages
42(2010) :4 , p. 748-750
ISSN
1386-9477
ISI
000276541200022
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We present a theoretical study of the optoelectronic properties of monolayer graphene. Including the effect of the electron-photon-phonon scattering, we employ the mass- and energy-balance equations derived from the Boltzmann equation to evaluate self-consistently the carrier densities, optical conductance and transmission coefficient in graphene in the presence of linearly polarized radiation field. We find that the photo-excited carrier density can be increased under infrared radiation and depend strongly on radiation intensity and frequency. For short wavelengths (lambda <3 mu m), the universal optical conductance sigma(0) = e(2)/4h is obtained and the light transmittance is about 0.97-0.98. Interestingly, there is an optical absorption window in the range 4-100 mu m which is induced by different transition energies required for inter- and intra-band optical absorption. The position and width of this absorption window depend sensitively on temperature and carrier density of the system. These results are relevant for applications of recently developed graphene devices in advanced optoelectronics such as the infrared photodetectors. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
E-info
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