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- W2964343166 abstract "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." @default.
- W2964343166 created "2019-07-30" @default.
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- W2964343166 date "2010-03-12" @default.
- W2964343166 modified "2023-09-27" @default.
- W2964343166 title "Optics of flat carbon - spectroscopic ellipsometry of graphene flakes" @default.
- W2964343166 hasPublicationYear "2010" @default.
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