Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 16: Scanning Probe Techniques: Method Development

O 16.10: Vortrag

Montag, 17. März 2025, 17:15–17:30, H25

A high-throughput ESR-STM setup at mK temperatures — •Máté Stark, Jonas Arnold, Luise Renz, Johannes Schwenk, Christoph Sürgers, Wolfgang Wernsdorfer, and Philip Willke — Physikalisches Institut (PHI), Karlsruhe Institute of Technology, Karlsruhe, Germany

Characterizing and controlling single spins using Electron Spin Resonance Scanning Tunneling Microscopy (ESR-STM) [1] benefits from ultra-low temperatures, minimal noise, and efficient RF transmission to the junction. This work details upgrades to an ESR-STM system operating at mK temperatures within a compact dilution refrigerator under UHV conditions. We achieved an electronic temperature below 200 mK while maintaining effective RF transmission up to 40 GHz. In addition, we developed a compact UHV chamber with an automated sputter-annealing stage, allowing for efficient sample preparation and quick exchange of samples with various atoms and molecules atop. In combination with the fast cooldown of the dilution refrigerator, these upgrades greatly streamline the experimental workflows allowing for rapid and high quality ESR-STM measurements. [1] Baumann, S. et al., 350(6259), 2015.

Keywords: ESR-STM; Dilution Refrigerator; Electronic Temperature; UHV