Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 64: Surface Magnetism II (joint session O/MA)
MA 64.4: Talk
Friday, March 20, 2020, 11:15–11:30, GER 38
Charge transport between discrete superconducting bound states at the atomic scale — •Haonan Huang1, Ciprian Padurariu2, Jacob Senkpiel1, Robert Drost1, Björn Kubala2, Juan Carlos Cuevas3, Alfredo Levy Yeyati3, Joachim Ankerhold2, Klaus Kern1,4, and Christian R. Ast1 — 1MPI für Festkörperforschung, Stuttgart, Germany — 2Institut für komplexe Quantensysteme, Universität Ulm, Ulm, Germany — 3Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain — 4EPFL, Switzerland
A Yu-Shiba-Rusinov (YSR) state is a pair of in-gap states resulting from the interaction of magnetic atoms with a superconductor. While YSR states have received intensifying attention especially in the field of scanning tunneling microscopy (STM) due to its capability to resolve and measure the transport through single atom, the tunneling processes between YSR states still remain elusive. We are now able to controllably introduce YSR state of desired properties to the apex of the STM tip and measure the tunneling between the tip YSR state and a sample YSR state, which we call Shiba-Shiba tunneling. This results in a current peak at the sum of the two YSR energies. We observe a blockade in Shiba-Shiba peak when increasing conductance, which renders YSR tip a general probe of the single level lifetime at the atomic scale.