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Preprints
March 2010Thermal conductivity of graphene in Corbino membrane geometry
C. Faugeras, B. Faugeras, M. Orlita, M. Potemski, R.R. Nair, A.K. Geim
18 Mar 2010
On Graphene Hydrate
Wei L. Wang, Efthimios Kaxiras
17 Mar 2010
Energy Transfer from Individual Semiconductor Nanocrystals to Graphene
Zheyuan Chen, Stéphane Berciaud, Colin Nuckolls, Tony F. Heinz, Louis E. Brus
15 Mar 2010
Energy transfer from photoexcited zero-dimensional systems to metallic systems plays a prominent role in modern day materials science. A situation of particular interest concerns the interaction between a photoexcited dipole and an atomically thin metal. The recent discovery of graphene layers permits investigation of this phenomenon. Here we report a study of fluorescence from individual CdSe/ZnS nanocrystals in contact with single- and few-layer graphene sheets. The rate of energy transfer is determined from the strong quenching of the nanocrystal fluorescence. For single-layer graphene, we find a rate of ~ 4ns-1, in agreement with a model based on the dipole approximation and a tight-binding description of graphene. This rate increases significantly with the number of graphene layers, before approaching the bulk limit. Our study quantifies energy transfer to and fluorescence quenching by graphene, critical properties for novel applications in photovoltaic devices and as a molecular ruler.
Optics of flat carbon - spectroscopic ellipsometry of graphene flakes
V. G. Kravets, A. N. Grigorenko, R. R. Nair, P. Blake, S. Anisimova, K. S. Novoselov, A. K. Geim
12 Mar 2010
We demonstrate that visible transparency of any two-dimensional system with a symmetric electronic spectrum is governed by the fine structure constant and suggest a simple formula that relates a quasi-particle spectrum to an optical transmission of such a system. These results are applied to graphene flakes immobilized on a surface of oxidized silicon for which we measure ellipsometric spectra, extract optical constants of a graphene layer and reconstruct the electronic dispersion relation near K-point using optical transmission spectra. We also present spectroscopic ellipsometry analysis of graphene flakes placed on dielectric amorphous quartz substrates.
Electronic decoupling of an epitaxial graphene monolayer by gold intercalation
Isabella Gierz, Takayuki Suzuki, Dong Su Lee, Benjamin Krauss, Christian Riedl, Ulrich Starke, Hartmut Höchst, Jurgen H. Smet, Christian R. Ast, Klaus Kern
11 Mar 2010
Localization and One-Parameter Scaling in Hydrogenated Graphene
Junhyeok Bang, K. J. Chang
10 Mar 2010
The Effect of Cluster Formation on Graphene Mobility
K. M. McCreary, K. Pi, Adrian Swartz, Wei Han, W. Bao, C. N. Lau, F. Guinea, M. I. Katsnelson, R. K. Kawakami
10 Mar 2010
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