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Plasmon modes of spatially separated double-layer graphene Export

by: E. H. Hwang, S. Das Sarma
Physical Review B (Condensed Matter and Materials Physics), Vol. 80, No. 20. (2009), 205405.

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bilayer graphene plasmon

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We derive the plasmon dispersion in doped double-layer graphene (DLG), made of two parallel graphene monolayers with carrier densities n1 and n2, respectively, and an interlayer separation of d. The linear chiral gapless single-particle energy dispersion of graphene leads to DLG plasmon properties with several unexpected experimentally observable characteristic features such as a nontrivial influence of an undoped (n2=0) layer on the DLG plasmon dispersion and a strange influence of the second layer even in the weak-coupling d limit. At long wavelengths (q0), the density dependence of the plasma frequencies is different from the usual two-dimensional (2D) electron system with quadratic energy dispersion. Our predicted DLG plasmon properties clearly distinguish graphene from the extensively studied usual parabolic 2D electron systems.


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