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TT: Fachverband Tiefe Temperaturen
TT 42: Superconductivity: Tunneling and Josephson Junctions
TT 42.10: Talk
Thursday, March 20, 2025, 12:00–12:15, H32
High-Frequency Irradiation of Single-Atom Josephson Junctions — •Martina Trahms1,2, Bharti Mahendru2, Clemens B. Winkelmann1, and Katharina J. Franke2 — 1University Grenoble Alpes, LATEQS, 38042 Grenoble, France — 2Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
Understanding superconducting junctions on the atomic scale yields significant insights for the prospect of using superconducting circuits in future technological applications. Here, we investigate the influence of single magnetic adatoms (Mn) on the phase dynamics of current-biased Pb-Pb Josephson junctions in a scanning tunneling microscope (STM) in the presence of high-frequency (HF) irradiation that is applied via an antenna close to the junction. We observe Shapiro steps that indicate coherent absorption of the irradiation while at the same time phase diffusion is enhanced due to incoherent absorption. In the presence of a magnetic adatom, phase diffusion is more prominently enhanced compared to the pristine junction which indicates that the quantum spin of the magnetic impurity influences the coherence of the tunneling processes in the junction.
Keywords: Josephson junction; Single magnetic atoms; Superconductivity; High frequency irradiation