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O: Fachverband Oberflächenphysik

O 99: Spins on surfaces at the atomic scale III

O 99.6: Vortrag

Freitag, 13. März 2026, 10:45–11:00, WILL/A317

Magnetic quantum corrals on a proximity-superconducting Rashba surface alloy — •Jinkyung Kim, Harim Jang, Jens Wiebe, and Roland Wiesendanger — Department of Physics, University of Hamburg, Hamburg, D-20355, Germany

Quantum corrals can confine and resonate surface-state electrons at discrete eigenenergies. When coupled to superconducting substrates, quantum corrals can be used to sculpture Yu-Shiba-Rusinov (YSR) in-gap states as well as spin-degenerate Andreev bound states, referred to as Machida-Shibata (MS) states, due to proximity-induced Cooper pairing [1,2]. Here, we investigated quantum corrals crafted from Fe atoms on a proximity-superconducting BiAg2/Ag/Nb(110) heterostructure. Multiple in-gap states emerge with similar numbers of antinodes as in the eigenmode closest to the Fermi energy. They show an almost perfect spatial antiphasing between the particle- and hole-like components, reminiscent of long-range YSR states of individual magnetic atoms [3]. By further studying how these in-gap states evolve with corral size and the 3d metal atom species, our work characterizes the interplay between YSR and MS states within the quantum corral. [1] L. Schneider et al., Nature 621, 60-65 (2023) [2] K. Ton That et al., Nat. Phys. (2025) https://doi.org/10.1038/s41567-025-03109-y [3] H. Jang et al., arXiv:2506.17414 (2025)

Keywords: Quantum corral; Yu-Shiba-Rusinov states; Machida-Shibata states; Andreev bound states; Scanning tunneling microscopy