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O: Fachverband Oberflächenphysik
O 16: Scanning Probe Techniques: Method Development
O 16.12: Vortrag
Montag, 17. März 2025, 17:45–18:00, H25
The Josephson effect in the dynamical Coulomb blockade regime with high energy resolution — •Xianzhe Zeng1, Janis Siebrecht1, Haonan Huang1, Sujoy Karan1, Klaus Kern1,2, and Christian R. Ast1 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany — 2Institut de Physique, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
The Josephson effect can be used as a good quantitative indicator of the energy resolution of scanning tunneling microscopy (STM). Recently we have upgraded our mK-STM with low-temperature filtering on our scan head. We measured the Josephson current and found an improvement of the energy resolution by almost an order of magnitude. The high resolution allows us to measure several spectroscopic features in detail, including the superconducting coherence peaks with extreme sharpness and the environmental resonances in the Josephson current at low frequency due to the dynamical Coulomb blockade.
Keywords: scanning tunneling microscopy; Josephson effect; energy resolution; dynamical Coulomb blockade