Regensburg 2019 – wissenschaftliches Programm
MA 45.6: Vortrag
Donnerstag, 4. April 2019, 12:00–12:15, H15
Integrating Yu-Shiba-Rusinov states into a tunnel junction — •Christian R. Ast1, Haonan Huang1, Jacob Senkpiel1, Robert Drost1, Simon Dambach2, Ciprian Padurariu2, Björn Kubala2, Juan Carlos Cuevas3, Alfredo Levy Yeyati3, Joachim Ankerhold2, and Klaus Kern1,4 — 1MPI für Festkörperforschung, Stuttgart — 2Institut für komplexe Quantensysteme, Universität Ulm, Ulm — 3Universidad Autónoma de Madrid, Madrid, Spain — 4EPFL, Lausanne, Switzerland
Magnetic impurities in a superconductor give rise to subgap features called Yu-Shiba-Rusinov (YSR) states. On or near surfaces, these impurities can be well studied locally by scanning tunneling microscopy (STM). We have observed a non-trivial energy dependence of the YSR state as a function of tip-sample distance, similar to findings that have been reported before. The occurrence of this phenomenon deep in the tunneling regime suggests a non-negligible influence of the tip on the YSR impurity. Therefore, in order to interpret this energy dependence, a more holistic model of the tunnel junction including the YSR state is necessary. To this end, we discuss a model that extends the existing Green’s function description of YSR states and also bridges a gap to related models.