Journal
PHYSICAL REVIEW B
Volume 80, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.205405
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Funding
- DOE-Sandia
- US-ONR
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We derive the plasmon dispersion in doped double-layer graphene (DLG), made of two parallel graphene monolayers with carrier densities n(1) and n(2), 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 (n(2)=0) layer on the DLG plasmon dispersion and a strange influence of the second layer even in the weak-coupling d ->infinity limit. At long wavelengths (q -> 0), 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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