Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Poster Wednesday: Scanning Probe Techniques

O 72.5: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

The Kondo resonance line shape in scanning tunnelling spectroscopy: instrumental aspects — •Manuel Gruber, Alexander Weismann, and Richard Berndt — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany

The differential-conductance spectrum of magnetic adsorbates on surfaces can exhibit a zero-bias feature originating from the many-body Kondo effect. The intrinsic line shape of this Kondo resonance and its temperature dependence contain, in principle, valuable information. In the present study, using low-temperature scanning tunneling microscopy along with model calculations, we investigate the influence of instrumental broadening on the Kondo line shape of a model molecular Kondo system (all-trans retinoic acid on Au(111)). The modulation voltage used for the lock-in detection, noise on the sample voltage, and the temperature of the microscope tip are considered [1].

This work was supported by the DFG through SFB 677 and the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 766726.

[1] M. Gruber, A. Weismann, R. Berndt, J. Phys. Condens. Matter 30, 424001 (2018)