Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 51: Poster Wednesday: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy

O 51.2: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Yu-Shiba-Rusinov band dispersion of infinite Mn chains on top of a semi-infinite Nb(110) surface — •Rik Broekhoven, Artem Pulkin, Antonio Manesco, Sander Otte, Anton Ahkmerov, and Michael Wimmer — Delft University of Technology, Delft, The Netherlands

Chains of magnetic atoms on s-wave superconductors have been proposed to have a topological non-trivial phase, when the induced in-gap Yu-Shiba-Rusinov (YSR) bands are p-wave gapped by for example spin-orbit coupling. In order to determine the topological phase diagram, experiments were previously limited to probing local quantities of the chain. Recent improvements in STM methodology have made it possible however to now also probe the YSR band dispersion relation. It was found to be highly dependent on the chain spacing and orientation with respect to the superconductor lattice.

Motivated by this discovery, here we present a method to evaluate the in-gap dispersion relation of chains with different orientations and spacing. In contrast to previous works, we work with infinite chains on a semi-infinite surface to make sure the system is larger than the superconductor coherence length. We focus on Mn atoms on top of superconducting Nb(110). First, we derive an effective tight-binding model from ab initio calculation, and subsequently we use the multidimensional Green's function formalism to extend to a semi-infinite system and solve for the corresponding in-gap YSR bands.