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Strong acoustic plasmons in chemically doped graphene induced by a nearby metal surface

Despoja, Vito; Novko, Dino; Lončarić, Ivor; Golenić, Neven; Marušić, Leonardo; Silkin, Vyacheslav M. (2019) Strong acoustic plasmons in chemically doped graphene induced by a nearby metal surface. Physical Review B, 100 (19). ISSN 2469-9950

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Recent theoretical considerations have demonstrated that free-standing graphene doped with alkali metals (ACx) supports strong Dirac and weak acoustic plasmons. Here we show that when ACx is deposited on a metal surface the effective Coulomb screening produced by the substrate can completely wash out these collective modes. However, even tiny detachment of the ACx layer from the metal surface recovers the ACx plasmonic properties. Especially the acoustic plasmon intensity is strongly enhanced in comparison to a free-standing case. We further provide the physical background of these intriguing phenomena. The studied systems consist of lithium- and cesium-doped graphene layers deposited on the Ir(111) surface.

Item Type: Article
Uncontrolled Keywords: density functional theory; plasmonics
Subjects: NATURAL SCIENCES > Physics > Condensed Matter Physics
Divisions: Theoretical Physics Division
Depositing User: Ivor Lončarić
Date Deposited: 19 Nov 2019 12:58
Last Modified: 19 Nov 2019 12:58
DOI: 10.1103/PhysRevB.100.195401

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