Plasmon excitations for encapsulated graphene

We have developed an analytical formulation to calculate the plasmon dispersion relation for a two-dimensional layer which is encapsulated within a narrow spatial gap between two bulk half-space plasmas. This is based on a solution of the inverse dielectric function integral equation within the rand...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2016-06, Vol.49 (22), p.225101-225107
Main Authors: Gumbs, Godfrey, Horing, N J M, Iurov, Andrii, Dahal, Dipendra
Format: Article
Language:English
Subjects:
Dispersion
encapsulated
Encapsulation
excitations
Graphene
Half spaces
Mathematical analysis
Plasma frequencies
Plasmons
Two dimensional
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Summary:We have developed an analytical formulation to calculate the plasmon dispersion relation for a two-dimensional layer which is encapsulated within a narrow spatial gap between two bulk half-space plasmas. This is based on a solution of the inverse dielectric function integral equation within the random-phase approximation (RPA). We take into account the nonlocality of the plasmon dispersion relation for both gapped and gapless graphene as the sandwiched two-dimensional (2D) semiconductor plasma. The associated nonlocal graphene plasmon spectrum coupled to the 'sandwich' system is exhibited in density plots, which show a linear mode and a pair of depolarization modes shifted from the bulk plasma frequency.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/49/22/225101