Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 54: Electronic structure II

O 54.6: Vortrag

Mittwoch, 24. März 2010, 16:15–16:30, H33

Field Emission Resonances on Au Atomic Chains: Periodic Energy Variations on a sub-nm Scale — •Stefan Polei, Ingo Barke, Kristian Sell, Viola von Oeynhausen, and Karl-Heinz Meiwes-Broer — Institut für Physik, Universität Rostock, Universitätsplatz 3, D-18051 Rostock

We present scanning tunneling spectroscopy (STS) data of field emission resonances (FER) on the quasi one-dimensional Si(111)5x2-Au structure. The image-state derived FER are investigated by dI/dV measurements in the energy range near the vacuum energy and above. A distinct splitting of the first peak in dI/dV curves is observed when varying the location perpendicular to the chains. The effect appears on a length-scale of less than one nanometer. We assign the splitting to variations of the local work function [1].

[1] H. C. Ploigt, C. Brun, M. Pivetta, F. Patthey, and W. D. Schneider, Phys. Rev. B 76, 195404 (2007).