SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 85: Electronic Structure of Surfaces II

O 85.4: Talk

Thursday, March 30, 2023, 15:45–16:00, REC C 213

Ultra-thin Noble Metal Films on Superconductors — •Christian von Bredow, Philip Beck, Lucas Schneider, Jens Wiebe, and Roland Wiesendanger — Department of Physics - University of Hamburg, Hamburg, Germany

Magnet-superconductor hybrid systems involving Rashba-split surface states proximitized by a superconducting substrate are promising platforms for the realization of topological superconductivity [1,2,3]. To that end, a large gap of the superconductor, strong spin-orbit coupling, and a high surface quality that allows for the manipulation of individual magnetic atoms using the tip of a scanning tunneling microscope are strongly desired. In order to engineer a system with the desired properties we investigate the growth and surface-state dispersion of thin noble metal films on the (110)-surface of the elemental superconductor with the highest critical temperature, niobium. Starting from a few monolayer thickness, we observe the well known quasiparticle interference of the Shockley (111) surface state. Bias-dependent data is used to extract the layer-thickness dependence of the band bottom and the effective electron mass.

[1] A. C. Potter et al., Phys. Rev. B 85, 094516 (2012).

[2] A. Palacio-Morales et al., Science Advances 5 eaav6600 (2019)

[3] T. Tomanic et al., Phys. Rev. B 94, 220503 (2016).