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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: Vortrag

Freitag, 11. März 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 Brihuega¹ — ¹Dept. 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 .