Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 99: Focus Session: Spins on Surfaces III (joint session O/MA)

O 99.7: Talk

Friday, April 5, 2019, 12:15–12:30, H24

Investigation of superconductivity in spin chains on Re(0001) — •Lucas Schneider, Manuel Steinbrecher, Levente Rósza, Thore Posske, Jens Wiebe, and Roland Wiesendanger — Department of Physics, Hamburg University, 20355 Hamburg, Germany

Chains of magnetic atoms on high-Z s-wave superconductors can exhibit topological superconductivity and therefore host Majorana bound states at their ends [1, 2]. Most previous experimental work focused on self-assembled systems [3-4] where a change of the composition along the chain is difficult to achieve. In this study, we use the superconducting Re substrate which enables scanning tunneling microscope-tip induced assembly of chains that show indications for topological superconductivity [5]. This technique allows us to perfectly control the geometric properties and chemical composition of the chains. We evaporate different 3d transition metal adatoms as building blocks, assemble various linear chains and investigate their in-gap states. In particular, we studied the transition between magnetic and nonmagnetic regions in composite chains.

We acknowledge funding by the ERC via the Advanced Grant ADMIRE (No. 786020).

[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).