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Tuning and Persistent Switching of Graphene Plasmons on a Ferroelectric Substrate.

  • Author(s): Goldflam, Michael D
  • Ni, Guang-Xin
  • Post, Kirk W
  • Fei, Zhe
  • Yeo, Yuting
  • Tan, Jun You
  • Rodin, Aleksandr S
  • Chapler, Brian C
  • Özyilmaz, Barbaros
  • Castro Neto, Antonio H
  • Fogler, Michael M
  • Basov, DN
  • et al.
Abstract

We characterized plasmon propagation in graphene on thin films of the high-κ dielectric PbZr0.3Ti0.7O3 (PZT). Significant modulation (up to ±75%) of the plasmon wavelength was achieved with application of ultrasmall voltages (< ±1 V) across PZT. Analysis of the observed plasmonic fringes at the graphene edge indicates that carriers in graphene on PZT behave as noninteracting Dirac Fermions approximated by a semiclassical Drude response, which may be attributed to strong dielectric screening at the graphene/PZT interface. Additionally, significant plasmon scattering occurs at the grain boundaries of PZT from topographic and/or polarization induced graphene conductivity variation in the interior of graphene, reducing the overall plasmon propagation length. Lastly, through application of 2 V across PZT, we demonstrate the capability to persistently modify the plasmonic response of graphene through transient voltage application.

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