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O: Fachverband Oberflächenphysik

O 13: Poster Session I: Surface magnetism I

O 13.4: Poster

Monday, March 1, 2021, 10:30–12:30, P

Evidence of topological Shiba bands in artificial spin chains on superconductors — •Lucas Schneider¹, Philip Beck¹, Thore Posske^2,3, Daniel Crawford⁴, Eric Mascot⁵, Stephan Rachel⁴, Roland Wiesendanger¹, and Jens Wiebe¹ — ¹Department of Physics, Hamburg University — ²I. Institute for Theoretical Physics, Hamburg University — ³Centre for Ultrafast Imaging Hamburg — ⁴School of Physics, University of Melbourne — ⁵Department of Physics, University of Illinois at Chicago

Magnetic chains on superconducting substrates are a promising system to realize topological superconductivity and Majorana states [1-3]. In this study, we use the tip of a scanning tunneling microscope to assemble magnetic chains atom-by-atom on the surface of an elemental superconductor. We analyze Bogoliubov quasiparticle interference, reveal the formation of multiple in-gap bands and access momentum information about the band dispersions. Using this information, we find evidence that one of the bands is topologically non-trivial and gapped by effective p-wave correlations. This work features an important step towards the distinct experimental determination of topological phases from bulk properties only. We acknowledge funding by the ERC via the Advanced Grant ADMIRE (No. 786020), by the Cluster of Excellence ’Advanced Imaging of Matter’ (EXC 2056 - project ID 390715994) and by the DFG (SFB-925 - project 170620586). [1] J. Li et al. PRB 90, 235433 (2014). [2] S. Nadj-Perge et al., Science 346, 6209 (2014). [3] H. Kim et al., Science Advances 4, eaar5251 (2018).