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TT: Fachverband Tiefe Temperaturen

TT 53: Topology: Majorana Physics

TT 53.1: Vortrag

Donnerstag, 19. März 2020, 09:30–09:45, HSZ 103

Finite-size effects in the in-gap bands of artificial spin chains on superconductors — •Lucas Schneider, Philip Beck, Levente Rózsa, Jens Wiebe, and Roland Wiesendanger — Department of Physics, Hamburg University, 20355 Hamburg, Germany

Magnetic chains on superconducting substrates are a promising system to realize topological superconductivity and Majorana bound states [1-5]. 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 and study the formation of multiple in-gap bands with increasing chain length. We observe different pronounced effects due to the finite length and an even or odd number of atoms in the chain. Furthermore, the symmetry of the underlying substrate offers multiple building directions with different inter-atomic spacings which enables to tune the electronic and magnetic interactions within the chain.
We acknowledge funding by the ERC via the Advanced Grant ADMIRE (No. 786020) and by the Cluster of Excellence ’Advanced Imaging of Matter’ (EXC 2056 - project ID 390715994).

[1] Klinovaja et al., PRL 111, 186805 (2013)

[2] J. Li et al. PRB 90, 235433 (2014)

[3] S. Nadj-Perge et al., Science 346, 6209 (2014)

[4] M. Ruby et al., Nano Letters 17, 4473, (2017)

[5] H. Kim et al., Science Advances 4, eaar5251 (2018).