Guided plasmons in graphene p-n junctions

Details Guided plasmons in graphene p-n junctions Guided plasmons in graphene p-n junctions

2009-12-30

arxiv.org/abs/1001.0011v2

Phys. Rev. Lett. 104, 156806 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 1 figure; published version, numerical estimates added

Scientific paper

10.1103/PhysRevLett.104.156806

Spatial separation of electrons and holes in graphene gives rise to existence of plasmon waves confined to the boundary region. Theory of such guided plasmon modes within hydrodynamics of electron-hole liquid is developed. For plasmon wavelengths smaller than the size of charged domains plasmon dispersion is found to be \omega ~ q^(1/4). Frequency, velocity and direction of propagation of guided plasmon modes can be easily controlled by external electric field. In the presence of magnetic field spectrum of additional gapless magnetoplasmon excitations is obtained. Our findings indicate that graphene is a promising material for nanoplasmonics.

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