Single layer graphene has been obtained on Ni (111) by dissociation of ethylene. Angle-resolved electron-energy-loss spectra show a low energy plasmon dispersing up to about 2 eV, resulting from fluctuation of a charge density located around the Fermi energy, due to hybridization between Ni and graphene states. The dispersion is typical of a two-dimensional charge layer, and the calculated Fermi velocity is a factor of ∼ 0.5 lower than in isolated graphene. © 2012 Elsevier B.V. All rights reserved.
Low energy two-dimensional plasmon in epitaxial graphene on Ni (111)
CUPOLILLO, Anna;CAPUTI, Lorenzo
2013-01-01
Abstract
Single layer graphene has been obtained on Ni (111) by dissociation of ethylene. Angle-resolved electron-energy-loss spectra show a low energy plasmon dispersing up to about 2 eV, resulting from fluctuation of a charge density located around the Fermi energy, due to hybridization between Ni and graphene states. The dispersion is typical of a two-dimensional charge layer, and the calculated Fermi velocity is a factor of ∼ 0.5 lower than in isolated graphene. © 2012 Elsevier B.V. All rights reserved.File in questo prodotto:
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