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

Journal Article · Thu Mar 26 04:00:00 EDT 2009 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3122348· OSTI ID:974432

Choi, Hyunyong; Borondics, Ferenc; Siegel, David A; Zhou, Shuyun Y; Martin, Michael C; Lanzara, Alessandra; Kaindl, Robert A

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 refects the minority-carrier recombination time.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Materials Sciences Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 974432
• Report Number(s): LBNL-1715E
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Vol. 94; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
DECAY
ELECTRONS
Infrared and THz spectroscopy
Ultrafast dynamics
Graphene and Graphite
PLASMA
RECOMBINATION
SPECTRA