Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-06-03
Phys. Rev. B 80, 205405 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages 4 figures
Scientific paper
10.1103/PhysRevB.80.205405
We derive the plasmon dispersion in doped double layer graphene (DLG), made of two parallel graphene mono-layers with carrier densities $n_1$ and $n_2$ respectively, and an inter-layer separation of $d$. The linear chiral gapless single particle energy dispersion of graphene leads to exotic 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 $d\to 0$ limit. Our predicted exotic DLG plasmon properties clearly distinguish graphene from the extensively studied usual parabolic 2D electron systems.
Hwang Euyheon H.
Sarma Sankar Das
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