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.
Double-layer graphene and topological insulator thin-film plasmons
M Polini;
2012
Abstract
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.File in questo prodotto:
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