Double-layer graphene and topological insulator thin-film plasmons

Details Double-layer graphene and topological insulator thin-film plasmons Double-layer graphene and topological insulator thin-film plasmons

2011-12-07

arxiv.org/abs/1112.1610v1

Phys. Rev. B 85, 085443 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 5 figures

Scientific paper

10.1103/PhysRevB.85.085443

We present numerical and analytical results for the optical and acoustic plasmon collective modes of coupled massless-Dirac two-dimensional electron systems. Our results apply to topological insulator (TI) thin films and to two graphene sheets separated by a thin dielectric barrier layer. We find that because of strong bulk dielectric screening TI acoustic modes are locked to the top of the particle-hole continuum and therefore probably unobservable.

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