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Paper   IPM / Physic / 12183
School of Physics
  Title:   Double-Layer Graphene and Topological Insulator Thin-Film Plasmons
  Author(s): 
1.  Rosario E.V. Profumo
2.  R. Asgari
3.  M. Polini
4.  A.H. MacDonald
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  85
  Year:  2012
  Pages:   085443
  Supported by:  IPM
  Abstract:
We present numerical and analytical results for the optical and acoustic plasmon collective modes of coupled massless-Dirac two-dimensional electron systems (MD2DESs). Our results apply to topological insulator (TI) thin lms and to two graphene sheets separated by a thin dielectric barrier layer. We nd that TI acoustic modes are locked to the top of the particle-hole continuum because of strong bulk TI dielectric screening and therefore probably unobservable.

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