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MA: Fachverband Magnetismus
MA 64: Surface Magnetism II (joint session O/MA)
MA 64.3: Vortrag
Freitag, 20. März 2020, 11:00–11:15, GER 38
Tunneling of Cooper pairs through a molecular junction — Cristina Mier1, Rose Reina1, Leonard Garnier2, Benjamin Verlhac2, Laurent Limot2, Nicolas Lorente1, and •Deung-Jang Choi1 — 1Centro de Física de Materiales (MPC) CSIC-EHU San Sebastián, Spain — 2Université de Strasbourg, CNRS, IPCMS, UMR 7504 Strasbourg, France
The tunneling of Cooper pairs between two superconductors connected through a weak link is called Josephson effect. Cooper pairs tunnel through Andreev bound states (ABS) which is localized to the weak link. The dependence of the ABS on the phase difference between the two superconductors fixes the way the Cooper pairs tunnel. ABS are a characteristic of the junction and they cannot be probed by varying the bias between the two superconductors since they take place at zero bias. This is very different from Yu-Shiba-Rusinov (YSR) in-gap state that can take place already for one superconductor and are due to the weakening of Cooper pairs produced by a magnetic impurity [1]. We will present experimental data and theoretical analysis characterizing the ABS of a reproducible Scanning Tunneling Microscope molecular junction giving us access to the elusive phase difference in an STM setup.
[1] Choi, D.-J. et al. Mapping the orbital structure of impurity bound states in a superconductor. Nat. Commun. 8, 15175 (2017).