Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 46: Poster Session: Graphene (joint session O/TT)

TT 46.6: Poster

Tuesday, March 13, 2018, 18:15–20:30, Poster A

Scanning Tunneling Microscopy and spectroscopy of Au islands on graphene/Rh(111) — •Anne Holtsch and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P.O. Box 151150, D-66041 Saarbrücken

Using scanning probe techniques we investigated how graphene (gr) electronically interacts with substrates in the presence of metallic islands on top of the gr layer. In the case of rhodium as a substrate, the band structure is significantly altered with respect to freestanding graphene due to the hybridization of its d orbital with the pz orbital of gr [1]. Using scanning tunneling spectroscopy (STS) the influence of Au Islands on top of the gr was investigated. The islands were deposited by in-situ evaporation. Subsequently their relative orientation with respect to the gr lattice was observed by scanning tunneling microscopy (STM). The STS measurements on and in the vicinity of the islands show locally varying electronic properties of the system. The presence of gold induces the opening of a band gap. At the same time there is an increase in conductivity, compared to the conductivities of gold and gr. Measurements show that the increase in conductivity is restricted to that area of the islands which adjoins to the gr. In this case both gr and gold contribute to a increase of the measured tunnel current.

[1] A. Holtsch, T. Euwens, B. Uder, S. Grandthyll, F. Müller, and U. Hartmann, Surf. Sci. 668 (2018) 107.