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

Research output: Contribution to journalArticlepeer-review

209 Citations (Scopus)

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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