Journal article

Topological Shiba bands in artificial spin chains on superconductors

Lucas Schneider, Philip Beck, Thore Posske, Daniel Crawford, Eric Mascot, Stephan Rachel, Roland Wiesendanger, Jens Wiebe

Nature Physics | NATURE RESEARCH | Published : 2021

Abstract

A major challenge in developing topological superconductors for implementing topological quantum computing is their characterization and control. It has been proposed that a p-wave-gapped topological superconductor can be fabricated with single-atom precision by assembling chains of magnetic atoms on s-wave superconductors with spin–orbit coupling. Here we analyse Bogoliubov quasiparticle interference in Mn chains, constructed atom by atom on Nb(110), and reveal the formation of multi-orbital Shiba bands using momentum-resolved measurements. We find evidence that one band features a topologically non-trivial p-wave gap, as inferred from its shape and particle–hole asymmetric intensity. Our w..

View full abstract

University of Melbourne Researchers

Grants

Awarded by Cluster of Excellence 'Advanced Imaging of Matter' of the Deutsche Forschungsgemeinschaft (DFG)


Awarded by 'Light induced dynamics and control of correlated quantum systems' of the Deutsche Forschungsgemeinschaft (DFG)


Awarded by DFG


Awarded by European Union via ERC Advanced Grant ADMIRE


Awarded by Australian Research Council


Funding Acknowledgements

L.S., P.B., T.P., J.W. and R.W. gratefully acknowledge funding by the Cluster of Excellence 'Advanced Imaging of Matter' (EXC 2056-project ID 390715994) of the Deutsche Forschungsgemeinschaft (DFG). L.S., P.B., J.W. and R.W. acknowledge support by the SFB 925-B9 'Light induced dynamics and control of correlated quantum systems' of the Deutsche Forschungsgemeinschaft (DFG). T.P. acknowledges support by the DFG (project no. 420120155). R.W. acknowledges funding by the European Union via ERC Advanced Grant ADMIRE (project no. 786020). S.R. acknowledges support from the Australian Research Council (DP200101118). We thank D. K. Morr, H. Jeschke and L. Rozsa for helpful discussions. T.P. thanks F. Pientka for clarifying remarks.