Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene

H. Choi; F. Borondics; D. A. Siegel; S. Y. Zhou; M. C. Martin; A. Lanzara; R. A. Kaindl

doi:10.1063/1.3122348

Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene

H. Choi, F. Borondics, D. A. Siegel, S. Y. Zhou, M. C. Martin, A. Lanzara, R. A. Kaindl

Research output: Contribution to journal › Article › peer-review

222 Scopus citations

Abstract

We study the broadband optical conductivity and ultrafast carrier dynamics of epitaxial graphene in the few-layer limit. Equilibrium spectra of nominally buffer, monolayer, and multilayer graphene exhibit significant terahertz and near-infrared absorption, consistent with a model of intra- and interband transitions in a dense Dirac electron plasma. Nonequilibrium terahertz transmission changes after photoexcitation are shown to be dominated by excess hole carriers, with a 1.2 ps monoexponential decay that reflects the minority-carrier recombination time.

Original language	English (US)
Article number	172102
Journal	Applied Physics Letters
Volume	94
Issue number	17
DOIs	https://doi.org/10.1063/1.3122348
State	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "We study the broadband optical conductivity and ultrafast carrier dynamics of epitaxial graphene in the few-layer limit. Equilibrium spectra of nominally buffer, monolayer, and multilayer graphene exhibit significant terahertz and near-infrared absorption, consistent with a model of intra- and interband transitions in a dense Dirac electron plasma. Nonequilibrium terahertz transmission changes after photoexcitation are shown to be dominated by excess hole carriers, with a 1.2 ps monoexponential decay that reflects the minority-carrier recombination time.",

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AU - Choi, H.

AU - Borondics, F.

AU - Siegel, D. A.

AU - Zhou, S. Y.

AU - Martin, M. C.

AU - Lanzara, A.

AU - Kaindl, R. A.

N1 - Funding Information: This work was supported by the DOE Office of Basic Energy Sciences, Contract DE-AC02-05CH11231. F.B. acknowledges a scholarship of the Rosztoczy Foundation.

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Y1 - 2009

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AB - We study the broadband optical conductivity and ultrafast carrier dynamics of epitaxial graphene in the few-layer limit. Equilibrium spectra of nominally buffer, monolayer, and multilayer graphene exhibit significant terahertz and near-infrared absorption, consistent with a model of intra- and interband transitions in a dense Dirac electron plasma. Nonequilibrium terahertz transmission changes after photoexcitation are shown to be dominated by excess hole carriers, with a 1.2 ps monoexponential decay that reflects the minority-carrier recombination time.

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Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene

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