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

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

2009-03-03

arxiv.org/abs/0903.0577v2

Appl. Phys. Lett. 94, 172102 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, final version

Scientific paper

10.1063/1.3122348

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. Non-equilibrium terahertz transmission changes after photoexcitation are shown to be dominated by excess hole carriers, with a 1.2-ps mono-exponential decay that reflects the minority-carrier recombination time.

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