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Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 86: Graphene: Electronic Properties and Structure
(Joint session of DS, DY, HL, MA, O and TT organized by O)

TT 86.1: Talk

Friday, March 11, 2016, 10:30–10:45, S051

Graphene tunable transparency to tunneling electrons: A direct tool to measure the local coupling. — •Héctor González Herrero1, Antonio Javier Martínez Galera2, Miguel Moreno Ugeda3, Delia Fernández Torre4, Pablo Pou4, Rubén Pérez4, José María Gómez Rodríguez1, and Iván Brihuega11Dept. Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — 2II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany — 3CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain — 4Dept. Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain

Graphene grown on metals has proven to be an excellent approach to obtain high quality graphene films. However, special care has to be taken in order to understand the interaction of graphene with the substrate since it can strongly modify its properties.

We have grown one monolayer graphene on Cu (111) by using a new technique. By means of low temperature STM/STS experiments, complemented by density functional theory calculations, we have obtained information about the structural and electronic properties of our graphene samples with atomic precision and high energy resolution. Our work shows that depending on the STM tip apex and the tunnel parameters we can get access to either the graphene layer, the copper surface underneath or even both at the same time. Moreover, this approach can also be applied to investigate the interaction of point defects in the graphene layer with the underlying substrate .

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