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O: Fachverband Oberflächenphysik
O 11: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies II
O 11.5: Talk
Monday, March 18, 2024, 16:15–16:30, MA 004
Non-local detection of Yu-Shiba-Rusinov states in quantum corrals — Khai Ton That1, Chang Xu2, Ioannis Ioannidis3, Lucas Schneider1, Thore Posske3, Dirk K. Morr2, Roland Wiesendanger1, and •Jens Wiebe1 — 1Department of Physics, University of Hamburg, Hamburg, Germany — 2University of Illinois at Chicago, Chicago, USA — 3Institute for Theoretical Physics, University of Hamburg, Hamburg, Germany
Quantum mirages are non-local projections of local quantum states induced by an atomic-scale defect in a bath of conduction electrons that can be tailored by cages of nonmagnetic atoms, so-called quantum corrals [1,2]. Here, we observe, by scanning tunnel spectroscopy, the mirage of the Yu-Shiba-Rusinov (YSR) state induced by a magnetic atom in the gap of a superconductor and a characteristic corral-eigenenergy dependent oscillation in its particle-hole asymmetry. Our modelling shows that the mirage is dominated by an indirect coupling of the YSR state induced in the bulk superconductor with the corral eigenmodes. [1] H. Manoharan et al., Nature 403, 512 (2000); [2] L. Schneider et al., Nature 621, 60 (2023).
Keywords: scanning tunneling spectroscopy; Yu-Shiba-Rusinov state; superconductivity; Andreev bound states; proximity effect