SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 20: Poster: Spins and Magnetism at Surfaces
O 20.6: Poster
Monday, March 27, 2023, 18:00–20:00, P2/EG
Josephson diode effect due to single magnetic atoms — Martina Trahms1, Larissa Melischek2, Jacob F. Steiner2, •Bharti Mahendru1, Idan Tamir1, Nils Bogdanoff1, Olof Peters1, Gaël Reecht1, Clemens B. Winkelmann3, Felix von Oppen2, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany — 3Université Grenoble Alpes, CNRS, Institut Neél, 25 Avenue des Martyrs, 38042 Grenoble, France
Properties of Cooper-pair tunneling through a Josephson junction can be described by the phase difference between two superconductors. In a current-biased Josephson junction, the phase dynamics can be accessed via switching and retrapping currents. Here, we investigate Josephson junctions formed by a superconducting Pb tip and a Pb surface in a scanning tunneling microscope. While pristine Pb-Pb junctions are hysteretic but symmetric in the biasing direction, we observe asymmetric retrapping currents in the presence of single magnetic atoms placed in the junction. The behavior thus mimics diode properties in the retrapping current. We model the phase dynamics of these junctions by an extended resistively and capacitively shunted Josephson junction (RCSJ). We find the asymmetric retrapping current originates in a non-ohmic dissipative channel due to the particle-hole-symmetry-broken Yu-Shiba-Rusinov (YSR) states. By investigating different magnetic adatoms on different Pb surfaces, we carve out a general relation of asymmetric YSR states and asymmetric retrapping currents.