Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Scanning Probe Techniques: Method development

O 64.5: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG3

Combined pump probe experiments with scanning tunneling microscopy — •Kira Kolpatzeck, Philip Kapitza, Ebru Ekici, Rolf Möller, and Christian A. Bobisch — Faculty of Physics, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany

We will employ two experimental strategies to analyze charge carrier dynamics and luminescence with atomic scale lateral resolution by pump-probe spectroscopy. For timescales down to 1 ns, all electronic pump-probe measurements with a scanning tunneling microscope (STM) [1] are performed. Here, our first results show, that the luminescence that stems from inelastic tunneling processes can be used to quantitative map fast voltage pulses in the tunnel junctions [2]. This is achieved by performing time correlated counting of the emitted photons during the voltage pulse. In parallel, we develop and build an experiment in which THz radiation is coupled into the tunneling junction of a new build STM to allow for pump-probe experiments in the ps range [3]. The concept of the experimental setup will be presented.

[1] S. Loth et al., Science 329, 1628 (2010).
[2] C. Grosse et al., Appl. Phys. Lett. 103, 183108 (2013).
[3] T. L. Cocker et al., Nature Photonics 7, 620 (2013).