Changing character of electronic transitions in graphene: From single-particle excitations to plasmons

Novko, Dino and Despoja, Vito and Šunjić, Marijan (2015) Changing character of electronic transitions in graphene: From single-particle excitations to plasmons. Physical Review B, 91 (19). pp. 195407-7. ISSN 1098-0121

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Abstract

In this paper we clarify the nature of π and π + σ electron excitations in pristine graphene. We clearly demonstrate the continuous transition from single particle to collective character of such excitations and how screening modifies their dispersion relations. We prove that π and π + σ plasmons do exist in graphene, though occurring only for a particular range of wave vectors and with finite damping rate. Particular attention is paid to comparing the theoretical results with available EELS measurements in optical (Q ≈ 0) and other (Q not equal 0) limits. The conclusions, based on microscopic numerical results, are confirmed in an approximate analytical approach.

Item Type: Article
Date: 11 May 2015
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2015) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 11 Jun 2015 10:09
Last Modified: 11 Jun 2015 10:09
URI: http://digre.pmf.unizg.hr/id/eprint/4038

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