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

Hyunyong Choi, F. Borondics, D. A. Siegel, Shou Yong Zhou, M. C. Martin, A. Lanzara, R. A. Kaindl

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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.
Original languageEnglish
Article number172102
JournalApplied Physics Letters
Publication statusPublished - 2009 Apr

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graphene
electromagnetism
broadband
electron plasma
minority carriers
photoexcitation
infrared absorption
buffers
conductivity
decay

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Choi, H., Borondics, F., Siegel, D. A., Zhou, S. Y., Martin, M. C., Lanzara, A., & Kaindl, R. A. (2009). Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene. Applied Physics Letters, [172102].
Choi, Hyunyong ; Borondics, F. ; Siegel, D. A. ; Zhou, Shou Yong ; Martin, M. C. ; Lanzara, A. ; Kaindl, R. A. / Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene. In: Applied Physics Letters. 2009.
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Choi, H, Borondics, F, Siegel, DA, Zhou, SY, Martin, MC, Lanzara, A & Kaindl, RA 2009, 'Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene', Applied Physics Letters.

Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene. / Choi, Hyunyong; Borondics, F.; Siegel, D. A.; Zhou, Shou Yong; Martin, M. C.; Lanzara, A.; Kaindl, R. A.

In: Applied Physics Letters, 04.2009.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene

AU - Choi, Hyunyong

AU - Borondics, F.

AU - Siegel, D. A.

AU - Zhou, Shou Yong

AU - Martin, M. C.

AU - Lanzara, A.

AU - Kaindl, R. A.

PY - 2009/4

Y1 - 2009/4

N2 - 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.

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.

M3 - Article

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

M1 - 172102

ER -

Choi H, Borondics F, Siegel DA, Zhou SY, Martin MC, Lanzara A et al. Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene. Applied Physics Letters. 2009 Apr. 172102.