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Open AccessArticle

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

Institute of Physics, Bijenička 46, Zagreb HR-10000, Croatia
Donostia International Physics Center (DIPC), P. Manuel de Lardizabal, 20018 San Sebastian, Basque Country, Spain
Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia
Department of Physical and Chemical Sciences, University of L’Aquila, via Vetoio, 67100 L’Aquila (AQ), Italy
Consiglio Nazionale delle Ricerche (CNR), Istituto per la Microelettronica e Microsistemi (IMM), VIII strada 5, 95121 Catania, Italy
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;
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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