Tuning and Persistent Switching of Graphene Plasmons on a Ferroelectric Substrate.
Nano Lett
; 15(8): 4859-64, 2015 Aug 12.
Article
en En
| MEDLINE
| ID: mdl-26181908
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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01-internacional
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MEDLINE
Idioma:
En
Revista:
Nano Lett
Año:
2015
Tipo del documento:
Article
País de afiliación:
Estados Unidos