Regensburg 2007 – scientific programme

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O: Fachverband Oberflächenphysik

O 30: Nanostructures at Surfaces III (Dots, Particles, Clusters)

O 30.2: Talk

Tuesday, March 27, 2007, 16:00–16:15, H36

Single-atom contact and spectroscopy — •J. Kröger¹, N. Néel¹, L. Limot¹, H. Jensen¹, R. Berndt¹, K. Palotas², and W.H. Hofer² — ¹Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — ²University of Liverpool, Liverpool L69 3BX, United Kingdom

The tip of a scanning tunnelling microscope is controllably brought into contact with a flat surface of Au(111), with individual gold atoms on Au(111) and with a single Co atom adsorbed on Cu(100). Contact between the tip and the sample as well as between the tip and single atoms is established at roughly a conductance quantum. Conductance measurements performed on the face-centered cubic and hexagonal close-packed stacking domains of the Au(111) surface reconstruction lead to similar results. While for Cu(100)-Co the Kondo effect-induced resonance is retained in contact it becomes broader than in the tunnelling regime. Calculations indicate that the proximity of the tip shifts the cobalt d-band and thus affects the Kondo temperature.