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O: Fachverband Oberflächenphysik

O 68: Poster: Scanning Probe Techniques: Method Development

O 68.9: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

Towards light-wave scanning tunneling microscopy in strong magnetic fields — Victoria Ruckerbauer, •Felix Giselbrecht, Andreas Rank, Christoph Rohrer, Leo Ringer, Michael Betz, Christian Meineke, Jakob Schlosser, Rupert Huber, and Jascha Repp — Department of Physics, University of Regensburg, Regensburg, 93040, Germany

In light-wave-driven scanning tunneling microscopy (LW-STM) the tunneling junction is biased by an ultrashort laser pulse instead of having a static voltage [1]. This method enables combined Ångström and femtosecond spatiotemporal resolution as demonstrated by the direct observation of the ultrafast motion of a molecular orbital [2]. Combining this development with a tunable magnetic field would allow to follow spin dynamics – spin precession, for example – in molecules and other atomic structures with single-electron sensitivity. To this end, a novel LW-STM is being developed with an external magnetic field to resolve single-spin dynamics with atomic spatial and ultrafast temporal resolution. We will discuss the instrumental challenges of this development and present the resulting instrument design including the STM head, the laser source as well as the solution to introduce the laser transient from outside the vacuum system to the STM junction. [1] Cocker et al., Nature Photonics 7, 620 (2013), [2] Cocker et al., Nature 539, 263 (2016).

Keywords: scanning probe microscope; scanning tunneling microscope; lightwave STM; terahertz STM; instrument development