SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 7: Spins on Surfaces at the Atomic Scale I

O 7.3: Vortrag

Montag, 27. März 2023, 11:15–11:30, REC C 213

Atom-by-Atom Study of Spin Lattices on a Superconducting Rashba Material — •Khai That Ton, Lucas Schneider, Jens Wiebe, and Roland Wiesendanger — Department of Physics - University of Hamburg, Hamburg, Germany

In the research field of topological superconductivity, Rashba-spin-orbit-coupling is believed to be a stabilizing parameter for topological phases, increasing the size of the topological gap.

One well-known category of materials with large spin-orbit coupling are Bismuth-based surface alloys, which have been extensively studied by surface-sensitive methods like angle-resolved photoemission and scanning tunneling spectrosopy [1,2,3,4]. However, studies of such materials proximitized by superconducting substrates are lacking so far. In this work, we grew Bismuth-based surface alloys on thin films proximitized by elementary superconducting substrates, adsorbed transition metal atoms, and then built dimers, chains and small two-dimensional lattices of these atoms via STM-tip based atom manipulation. We will present a scanning tunneling spectroscopy investigation of the low-energy electronic structure of these different spin lattices.

[1] C. R. Ast et al. Phys. Rev. Lett. 98, 186807 (2007).

[2] C. R. Ast et al., Phys. Rev. B 75, 201401(R) (2007).

[3] M. Steinbrecher et al., Phys. Rev. B 87, 245436 (2013).

[4] W. Jolie et al., ACS Nano 16, 4876*4883 (2022).