Negative dynamic conductivity of a current-driven array of graphene nanoribbons

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We consider a periodic array of graphene nanoribbons under the action of a strong dc electric field E-0 and an external electromagnetic excitation with the frequency. and the lateral wave vector q. Solving the quasiclassical Boltzmann kinetic equation and calculating the surface dynamic conductivity sigma(2D)(q, omega, E-0) and the absorption coefficient of such a system we show that the real part of the conductivity and the absorption coefficient may become negative under certain conditions. Physically this corresponds to the amplification of the electromagnetic waves at the expense of the energy of the direct current source. The results are discussed in connection with experiments on the surface acoustic waves and on the Smith-Purcell-type graphene-based terahertz emitter.
Publisher
AMER PHYSICAL SOC
Issue Date
2016-07
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.94, no.3, pp.035439

ISSN
2469-9950
DOI
10.1103/PhysRevB.94.035439
URI
http://hdl.handle.net/10203/261885
Appears in Collection
PH-Journal Papers(저널논문)
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