SKM 2023 – wissenschaftliches Programm

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SYTS: Symposium Topological Superconductor-Magnet Heterostructures

SYTS 1: Topological Superconductor-Magnet Heterostructures

SYTS 1.3: Hauptvortrag

Donnerstag, 30. März 2023, 16:00–16:30, HSZ 01

Experimental study of minigaps and end states in bottom-up designed multi-orbital Shiba chains — •Jens Wiebe — Universität Hamburg, Department of Physics, 20355 Hamburg, Germany

Chains of transition-metal atoms on s-wave superconductors evoke multiorbital Shiba bands inside the gap of the substrate. If a spin-orbit coupled band overlaps with the Fermi energy, a topologically nontrivial minigap may open up which can potentially host Majorana bound states at the chain’s ends. We study atom-by-atom fabricated chains with respect to such phenomena [1]. Most recent strategies in order to increase the width of topological minigaps [2,3] and experimental methods to decide on the Majorana nature of close-to-zero-energy end states [4] will be presented.

Funding by the DFG via the Cluster of Excellence "Advanced Imaging of Matter" (EXC 2056-project ID 390715994) and via the SFB-925-project 170620586 is acknowledged
[1] L. Schneider et al., Nature Physics 17, 943 (2021)
[2] P. Beck et al., arXiv:2205.10062 [cond-mat.supr-con] (2022)
[3] P. Beck et al., arXiv:2205.10073 [cond-mat.supr-con] (2022)
[4] L. Schneider et al., arXiv:2211.00561v1 [cond-mat.supr-con]