Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

TT 14.1: Talk

Tuesday, March 18, 2025, 09:30–09:45, H18

Topological orbital Hall effect caused by skyrmions and antiferromagnetic skyrmions — •Lennart Schimpf, Ingrid Mertig, and Börge Göbel — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg

The topological Hall effect is a hallmark of topologically non-trivial magnetic textures such as magnetic skyrmions. It quantifies the transverse electric current once an electric field is applied and occurs as a consequence of the emergent magnetic field of the skyrmion. Likewise, an orbital magnetization is generated. Here we show that the charge currents are orbital polarized even though the conduction electrons couple to the skyrmion texture via their spin [1]. The topological Hall effect is accompanied by a topological orbital Hall effect even for s electrons without spin-orbit coupling. As we show, antiferromagnetic skyrmions and antiferromagnetic bimerons that have a compensated emergent field [2], exhibit a topological orbital Hall conductivity that is not accompanied by charge transport and can be orders of magnitude larger than the topological spin Hall conductivity.

[1] B. Göbel, L. Schimpf, I. Mertig, arXiv pre-print: 2410.00820

[2] B. Göbel, I. Mertig, O. Tretiakov, Physics Reports 895, 1 (2021)

Keywords: Skyrmions; Orbital Hall effect; Topological Hall effect; Orbitronics; Antiferromagnetic skyrmion