SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Mini-Symposium: Manipulation and control of spins on functional surfaces I

O 31.3: Hauptvortrag

Dienstag, 2. März 2021, 11:15–11:45, R2

Artificial spin chains on superconductor surfaces — •Jens Wiebe — Department of Physics, Hamburg University, Germany

A magnetic chain on an s-wave superconductor hosting a spin spiral or strong spin-orbit coupling can potentially realize a one-dimensional topological superconductor with Majorana bound states on its edges [1-5]. Here, we investigate artificial spin chains, which have been built atom-by-atom, with respect to the emergence of such topologically nontrivial electron phases. By this approach we not only vary the substrate and adatom species [6,7,8], but also tailor the interactions between the Yu-Shiba-Rusinov states induced by the adatoms [8] which eventually results in the formation of multi-orbital in-gap bands for the chain. We correlate the electronic properties of these bands with the spin structures of the chains as revealed by spin-resolved scanning tunneling spectroscopy [9].

We acknowledge funding by the ERC via the Advanced Grant ADMIRE (No. 786020), and by the DFG via the Cluster of Excellence 'Advanced Imaging of Matter' (EXC 2056-project ID 390715994) and the SFB-925-project 170620586.

[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). [6] L. Schneider et al., npj Quantum Materials 4, 42 (2019). [7] L. Schneider et al., Nature Commun. 11, 4707 (2020). [8] Ph. Beck et al., arXiv:2010.04031 [cond-mat.supr-con] (2020). [9] L. Schneider et al., Science Advances 7, eabd7302 (2021).