Image potential states as a quantum probe of graphene interfaces

Language
en
Document Type
Article
Issue Date
2022-02-11
First published
2010-02-18
Issue Year
2010
Authors
Bose, Sangita
Silkin, Vyacheslav M
Ohmann, Robin
Brihuega, Ivan
Vitali, Lucia
Michaelis, Christian H
Mallet, Pierre
Veuillen, Jean Yves
Schneider, M Alexander
Chulkov, Evgueni V
Editor
Abstract

Image potential states (IPSs) are electronic states localized in front of a surface in a potential well, formed by the surface projected bulk band gap on one side and the image potential barrier on the other. In the limit of a two-dimensional solid, a double Rydberg series of IPSs has been predicted, which is in contrast to a single series present in three-dimensional solids. Here, we confirm this prediction experimentally for mono- and bilayer graphene. The IPSs of epitaxial graphene on SiC are measured by scanning tunneling spectroscopy and the results are compared with ab-initio band structure calculations. Despite the presence of the substrate, both calculations and experimental measurements show that the first pair of the double series of IPSs survives and eventually evolves into a single series for graphite. Thus, IPSs provide an elegant quantum probe of the interfacial coupling in graphene systems.

Journal Title
New Journal of Physics
Volume
12
Issue
2
Citation

New Journal of Physics 12 (2010): 023028. https://iopscience.iop.org/article/10.1088/1367-2630/12/2/023028

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