Regensburg 2007 – scientific programme

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O: Fachverband Oberflächenphysik

O 32: Semiconductor Substrates

O 32.1: Talk

Tuesday, March 27, 2007, 15:45–16:00, H39

Dynamics and energetics of Ge(001) dimers — •Harold Zandvliet, Arie van Houselt, Raoul van Gastel, and Bene Poelsema — Physical Aspects of NanoElectronics & Solid State Physics, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands

The dynamic behavior of surface dimers on Ge(001) has been studied by positioning the tip of a scanning tunneling microscope over single flip-flopping dimers and measuring the tunneling current as a function of time. We observe that not just symmetric, but also asymmetric appearing dimers exhibit flip-flop motion. The dynamics of flip-flopping dimers can be used to sensitively gauge the local potential landscape of the surface. Through a spatial and time-resolved measurement of the flip-flop frequency of the dimers, local strain fields near surface defects can be accurately probed.