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MA: Fachverband Magnetismus

MA 35: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

MA 35.8: Talk

Thursday, March 21, 2024, 11:30–11:45, H 2013

Orbital Hall effect and orbital edge states caused by s electrons — •Oliver Busch, Ingrid Mertig, and Börge Göbel — Institut für Physik, Martin-Luther-Universität, D-06099 Halle

An orbital current can be generated whenever an object has a translational degree of freedom and a rotational degree of freedom. In condensed matter physics, intra-atomic contributions to the transverse orbital transport, labeled the orbital Hall effect, rely on propagating wave packets that must consist of hybridized atomic orbitals [1]. However, interatomic contributions have to be considered as well because they give rise to an alternative mechanism for generating orbital currents [2].

As we show, even wave packets consisting purely of s electrons can transport orbital angular momentum if they move on a cycloid trajectory [3]. We introduce the kagome lattice with a single s orbital per atom as the minimal model for the orbital Hall effect and observe the cycloid motion of the electrons in the surface states.

[1] D. Go et al., Physical Review Letters 121, 086602 (2018)

[2] A. Pezo et al., Physical Review B 106, 104414 (2022)

[3] O. Busch et al., Physical Review Research 5, 043052 (2023)

Keywords: Orbital Hall effect; Kagome lattice; Orbital edge states; Modern formulation of orbital magnetization; Orbitronics