Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Nanostructures at Surfaces II
O 20.2: Vortrag
Montag, 31. März 2014, 16:15–16:30, WIL B321
FeRh on Cu(100): Cluster substrate interaction in terms of band structure — •Ivan Baev1, Torben Beeck1, Kari Jänkälä2, Michael Martins1, and Wilfried Wurth1 — 1Institut für Experimentalphysik, Universität Hamburg — 2University of Oulu
Very small clusters are an important subject for a detailed understanding of emerging physical properties such as catalytic behavior or magnetic moments. Theoretical models are often limited to small scales because of their complexity. But band structure calculations of metallic crystals have already been performed since the 1960’s and are by now well understood. This forms an ideal reference for experimental measurements.
We will present measurements of the Cu(100) band structure along the Γ X direction measured by photoelectron spectroscopy and the influence of small FeRh clusters deposited via soft landing on the copper surface. Changes to the band structure are very strong and depend on the size and the type of clusters atoms involved.
The hybridization of the clusters with the substrate is distinct and affects the copper band in a symmetry adapted way. We will show how it is able to change the substrate band structure atom by atom. Ideally this will enable the tailoring of perfect systems for each given application by tailoring atomic orbitals: e.g. for magnetism a high density of states at the Fermi edge with high spin polarization is desirable while for catalytic materials a matching of molecular orbitals with the surface electronic states is more favorable.
This work is supported by the collaborative research center SFB 668.