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

被引：28

作者：

Politano, A. ^{[1
]}

Radovic, I. ^{[2
]}

Borka, D. ^{[2
]}

Miskovic, Z. L. ^{[3
,4
]}

Chiarello, G. ^{[1
]}

机构：

[1] Univ Calabria, Dipartmento Fis, I-87036 Arcavacata Di Rende, Italy

[2] Univ Belgrade, Vinca Inst Nucl Sci, Belgrade 11001, Serbia

[3] Univ Waterloo, Dept Appl Math, Waterloo, ON N2L 3G1, Canada

[4] Univ Waterloo, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada

来源：

CARBON | 2016年 / 96卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

EPITAXIAL GRAPHENE; ADSORPTION; CONSTANTS; CONTACTS; RU(0001); RANGE; MODE;

D O I：

10.1016/j.carbon.2015.09.053

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 pi and sigma 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 pi states of graphene and the d bands of Ni, which is not accounted for in the model. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：91 / 97

页数：7

共 79 条

[1] Electronic and geometric corrugation of periodically rippled, self-nanostructured graphene epitaxially grown on Ru(0001) [J].