Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Poster: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales

O 72.3: Poster

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

Luminescence on the atomic scale in a Terahertz Scanning Tunneling Microscope — •Johannes Schust, Kurt Lichtenberg, Felix Huber, Susanne Baumann, and Sebastian Loth — Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

The interplay between light and matter has a key role in solid-state research, and it constitutes a fundamental element of numerous contemporary technologies. Therefore, exploring the photonic properties of novel quantum systems is of high significance, while pushing the frontiers of both temporal and spatial resolution remains a persistent challenge. Here, we implement electroluminescence sensing into an ultra-fast Terahertz scanning tunneling microscope (STM), i.e. extend the system's capability to couple light directly out of the junction. Our exceptional vacuum chamber design features a thin slot that hosts the whole measuring unit in a flow-cryostat, while quartz windows on both sides give optical access and allow for the strait-forward adjustment of all further components at ambient conditions, precluding any complicated in-vacuum optical adjustments. Versatile optical concepts can be easily implemented and modified to the experimental needs in that way. With our unique setup, we harness the remarkable time resolution obtained by single Terahertz voltage pulses for time-resolved electroluminescence experiments. In particular, we will unravel field-induced electroluminescence with femtosecond time resolution, while simultaneously addressing samples with the atomic resolution provided by scanning probe microscopy.

Keywords: Scanning Tunneling Microscopy; Terahertz; Luminescence