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TT: Fachverband Tiefe Temperaturen

TT 78: Spin Transport and Orbitronics, Spin-Hall Effects II (joint session MA/TT)

TT 78.2: Vortrag

Donnerstag, 21. März 2024, 15:15–15:30, EB 107

Local violation of the reciprocity between the direct and inverse orbital Hall effects — •Dongwook Go^1,2, Tom S. Seifert^3,4, Tobias Kampfrath^3,4, Stefan Blügel¹, Hyun-Woo Lee⁵, and Yuriy Mokrousov^1,2 — ¹Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich, Germany — ²Institute of Physics, Johannes Gutenberg Universität Mainz, Mainz, Germany — ³Department of Physics, Freie Universität Berlin, Berlin, Germany — ⁴Department of Physical Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — ⁵Department of Physics, Pohang University of Science and Technology, Pohang, Korea

We theoretically investigate the reciprocity between the direct and inverse orbital Hall effects [1]. We show that the reciprocal relation between charge and orbital transport can be rigorously established by adopting the definition of the proper current that takes non-conservation effects into account [2]. Importantly, we find that the local reciprocity of charge and orbital currents is violated in thin films, as we demonstrate for the case of W(110) from first principles. Our results explain a seemingly inconsistent behavior of direct and inverse orbital Hall effect observed in recent experiments, where the two phenomena are found to be dominant in bulk and at surfaces, respectively [3,4]. References: [1] Go et al. In Preparation; [2] Shi et al. Phys. Rev. Lett. 96, 076604 (2007); [3] Hayashi et al. Commun. Phys. 6, 32 (2023); [4] Seifert et al. Nat. Nanotechnol. 18, 1132 (2023).

Keywords: orbital Hall effect; inverse orbital Hall effect; Onsager's reciprocity; orbitronics