SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems I

TT 6.6: Vortrag

Dienstag, 28. September 2021, 12:15–12:45, H7

Evidence for p-wave pairing and precursors of Majorana modes in artificial Shiba chains — •Jens Wiebe — Department of Physics, Universität Hamburg, Hamburg, Germany

Magnetic chains on s-wave superconductors hosting spin spirals or spin-orbit coupling may realize one-dimensional topological superconductors with Majorana modes on their edges. We study artificial spin chains built atom-by-atom [1] with respect to such phenomena. By variation of substrate and adatom species and interatomic distances in the chain [2-5], we adjust the energies of multi-orbital Yu-Shiba Rusinov states induced by the adatoms [2,3], their hybridizations [4], as well as the chains’ spin structures [5]. This enables to tailor the emerging multi-orbital Shiba bands such that p-wave gaps open [6]. We measure the length dependent energy oscillations of precursors of Majorana modes in short chains [7].

We acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via the Cluster of Excellence ’Advanced Imaging of Matter’ (EXC 2056-project ID 390715994), via the SFB-925-project 170620586, and by the ERC via the Advanced Grant ADMIRE (No. 786020).
[1] D.-J. Choi et al., Rev. Mod. Phys. 91, 041001 (2019)
[2] L. Schneider et al., npj Quantum Materials 4, 42 (2019)
[3] L. Schneider et al., Nature Commun. 11, 4707 (2020)
[4] P. Beck et al., Nat. Commun. 12, 2040 (2021)
[5] L. Schneider et al., Science Advances 7, eabd7302 (2021)
[6] L. Schneider et al., Nat. Phys. (2021) https://doi.org/10.1038/s41567-021-01234-y
[7] L. Schneider et al., arXiv:2104.11503 (2021)