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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.43: Poster

Tuesday, March 15, 2011, 18:30–22:00, P4

Equilibrium Step Fluctuations on Stepped Au(001) in Electrolyte — •Mohammad Alshakran¹, Guillermo Beltramo¹, Harald Ibach², and Margret Giesen¹ — ¹Institut für Complexe Systeme Biomechanik ICS-7, Forschungszentrum Jülich GmbH — ²Peter Grünberg Institut PGI-3 , Forschungszentrum Jülich GmbH

Equilibrium step fluctuations on stepped Au(001) with Miller indices (1 1 17) and (1 1 29) in electrolyte were studied by electrochemical scanning tunneling microscopy. Measuring the step-step correlation function we determine the time dependence of the fluctuations. From the time dependence one can deduce the dominant mass transport involved in the fluctuations as a function of the electrode potential. For both samples we find an exponent close to 1/4. Unexpectedly, the fluctuations depend also on the step-step distance with an exponent 3/2. The strong dependence on the step-step distance indicates a mass transport mechanism not considered yet theoretically. We furthermore obtained kink energies as a function of electrode potential. From that potential dependence we obtain a kink dipole moment in the order of 2.2 +/- 0.6 e pm.