Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Scanning Probe Microscopy and Spin Phenomena

O 63.2: Hauptvortrag

Mittwoch, 9. März 2016, 15:30–16:00, H4

Conductance and shot noise spectroscopy of single magnetic atoms and molecules — •Alexander Weismann — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel

The scanning tunneling microscope allows to build and study nanostructures at a single atom level. It can be further used to explore the ballistic electron transport regime by bringing the tip into contact with single atoms and molecules in a well-defined way. The measurement of quantum shot noise in nanoscopic contacts provides additional information on the underlying conduction processes and reveals a spin polarization of the current by single Fe and Co atoms between two gold electrodes. The impact of spin-orbit coupling on electron transport is demonstrated using single Ir atoms on a ferromagnetic substrate, where large changes of the anisotropic magnetoresistance occur between the tunneling and the contact regime. On retinoic acid, a closed-shell organic bio-molecules comprising only C, H and O atoms, the STM can be used to reversibly switch the spin state, which is attributed to the conversion into a radical cation.