Tuning and Persistent Switching of Graphene Plasmons on a Ferroelectric Substrate

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• 作者：Michael D. Goldflam ; Guang-Xin Ni ; Kirk W. Post ; Zhe Fei ; Yuting Yeo ; Jun You Tan ; Aleksandr S. Rodin ; Brian C. Chapler ; Barbaros 脰zyilmaz ; Antonio H. Castro Neto ; Michael M. Fogler ; D. N. Basov
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：15
• 期：8
• 页码：4859-4864
• 全文大小：391K
• ISSN：1530-6992

文摘

We characterized plasmon propagation in graphene on thin films of the high-魏 dielectric PbZr_0.3Ti_0.7O₃ (PZT). Significant modulation (up to 卤75%) of the plasmon wavelength was achieved with application of ultrasmall voltages (< 卤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.