Interband plasmons in supported graphene on metal substrates: Theory and experiments

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• 作者：A. Politano^a ; ^{antonio.politano@fis.unical.it" class="auth_mail" title="E-mail the corresponding author} ; I. Radović^b ; D. Borka^b ; Z.L. Mi&scaron ; ković^c ; G. Chiarello^a
• 刊名：Carbon
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：96
• 期：Complete
• 页码：91-97
• 全文大小：927 K

文摘

We present a theoretical modeling of the energy-loss spectroscopy data for monolayer graphene (MLG) supported by Pt(111), Ru(0001) and Ni(111) substrates. To reproduce the experimental loss function, we have used a two-dimensional, two-fluid hydrodynamic model for interband transitions of graphene's π and σ electrons and an empirical Drude–Lorentz model in the local approximation for metal substrates. The electronic response from the visible to the ultraviolet frequency range has been nicely reproduced for MLG/Pt(111) and MLG/Ru(0001). For graphene nanodomes on Ru(0001), the loss function of valleys shows an additional mode at 8–9 eV. By contrast, this models fails for the case of MLG/Ni(111), presumably due to the strong hybridization between the π states of graphene and the d bands of Ni, which is not accounted for in the model.