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Open AccessArticle

Insights on the Excitation Spectrum of Graphene Contacted with a Pt Skin

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Institute of Physics, Bijenička 46, Zagreb HR-10000, Croatia
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Donostia International Physics Center (DIPC), P. Manuel de Lardizabal, 20018 San Sebastian, Basque Country, Spain
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Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia
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Department of Physical and Chemical Sciences, University of L’Aquila, via Vetoio, 67100 L’Aquila (AQ), Italy
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Consiglio Nazionale delle Ricerche (CNR), Istituto per la Microelettronica e Microsistemi (IMM), VIII strada 5, 95121 Catania, Italy
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Department of Applied Mathematics, and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 703; https://doi.org/10.3390/nano10040703
Received: 1 March 2020 / Revised: 18 March 2020 / Accepted: 25 March 2020 / Published: 8 April 2020
(This article belongs to the Special Issue Science and Technology of Graphene)
The excitation spectrum in the region of the intraband (Dirac plasmon) and interband ( π plasmon) plasmons in graphene/Pt-skin terminated Pt 3 Ni(111) is reproduced by using an ab-initio method and an empirical model. The results of both methods are compared with experimental data. We discover that metallic screening by the Pt layer converts the square-root dispersion of the Dirac plasmon into a linear acoustic-like plasmon dispersion. In the long-wavelength limit, the Pt d electron excitations completely quench the π plasmon in graphene at about 4.1 eV, that is replaced by a broad peak at about 6 eV. Owing to a rather large graphene/Pt-skin separation (≈3.3 Å), the graphene/Pt-skin hybridization becomes weak at larger wave vectors, so that the π plasmon is recovered with a dispersion as in a free-standing graphene. View Full-Text
Keywords: dirac plasmon; π plasmon; graphene; EELS; plasmonics dirac plasmon; π plasmon; graphene; EELS; plasmonics
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MDPI and ACS Style

Despoja, V.; Radović, I.; Politano, A.; Mišković, Z.L. Insights on the Excitation Spectrum of Graphene Contacted with a Pt Skin. Nanomaterials 2020, 10, 703.

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