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| Paper IPM / P / 12183 |
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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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