▎ 摘　　要

We characterized plasmon propagation in graphene on thin Elms of the high-K 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.