SKM 2023 – wissenschaftliches Programm
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SYTS: Symposium Topological Superconductor-Magnet Heterostructures
SYTS 1: Topological Superconductor-Magnet Heterostructures
SYTS 1.4: Hauptvortrag
Donnerstag, 30. März 2023, 16:45–17:15, HSZ 01
Quantum spins and hybridization in artificially-constructed chains of magnetic adatoms on superconducting 2H-NbSe2 — •Katharina J. Franke — Freie Universität Berlin, Berlin, Germany
Magnetic adatom chains on superconducting substrates are promising platforms for topological superconductivity and Majorana zero modes. Signatures of these have been found in densely packed chains with direct exchange interaction among the adatoms. Theoretical predictions suggest chains, where the atoms are sufficiently far spaced that direct hybridization of their d orbitals is negligible, but close enough for substrate-mediated interactions, as an alternative platform.
We build such chains from individual Fe atoms on a 2H-NbSe2 substrate using the tip of a scanning tunneling microscope. In each step we track the evolution of the Yu-Shiba-Rusinov (YSR) states. We find signatures of quantum-spin behavior and YSR band formation consistent with ferromagnetic coupling [1,2].
[1] E. Liebhaber, L. M. Rütten, G. Reecht, J. F. Steiner, S. Rohlf, K. Rossnagel, F. von Oppen, K. J. Franke, Nat. Commun. 13, 2160 (2022)
[2] J. F. Steiner, C. Mora, K. J. Franke, F. von Oppen, Phys. Rev. Lett. 128, 036801 (2022)