Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 58: Surface magnetism II
MA 58.2: Vortrag
Freitag, 16. März 2018, 09:45–10:00, EB 202
Spin-Resolved Spectroscopy of the Yu-Shiba-Rusinov States of Individual Atoms — Lasse Cornils1, Anand Kamlapure1, Lihui Zhou1,3, Saurabh Pradhan2, Alexander A. Khajetoorians1,4, Jonas Fransson2, •Jens Wiebe1, and Roland Wiesendanger1 — 1Department of Physics, Hamburg University, D-20355 Hamburg, Germany — 2Department of Physics and Astronomy, Uppsala University, Uppsala SE-751 21, Sweden — 3Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 4Institute for Molecules and Materials (IMM), Radboud University, Nijmegen 6525 AJ, Netherlands
A magnetic atom in a superconducting host induces so-called Yu-Shiba-Rusinov (YSR) bound states inside the superconducting energy gap. By combining spin-resolved scanning tunneling spectroscopy with simulations we demonstrate that the pair of peaks associated with the YSR states of an individual Fe atom coupled to an oxygen-reconstructed Ta surface gets spin polarized in an external magnetic field [1]. As theoretically predicted, the electron and hole parts of the YSR states have opposite signs of spin polarizations which keep their spin character when crossing the Fermi level through the quantum phase transition. The simulation of a YSR state right at the Fermi level reveals zero spin polarization which can be used to distinguish such states from Majorana zero modes in chains of YSR atoms.
[1] L. Cornils, A. Kamlapure, L. Zhou, S. Pradhan, A. A. Khajetoorians, J. Fransson, J. Wiebe, and R. Wiesendanger, Phys. Rev. Lett. 119, 197002 (2017).