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MA: Fachverband Magnetismus

MA 64: Surface Magnetism II (joint session O/MA)

MA 64.4: Vortrag

Freitag, 20. März 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 Kern^1,4, 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.