Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-03-12
Phys. Rev. B 81, 155413 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 5 figures, accepted to Phys Rev B
Scientific paper
10.1103/PhysRevB.81.155413
We demonstrate that optical 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 absorption of such a system. These results are applied to graphene deposited 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 the K point using optical transmission spectra. We also present spectroscopic ellipsometry analysis of graphene placed on amorphous quartz substrates and report a pronounced peak in ultraviolet absorption at 4.6 eV because of a van Hove singularity in graphene's density of states. The peak is downshifted by 0.5 eV probably due to excitonic effects.
Anissimova S.
Blake Peter
Geim Andre K.
Grigorenko A. N.
Kravets V. G.
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