Journal Article

FZJ-2023-02639

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Observation of the orbital Hall effect in a light metal Ti

Choi, Y.-G. ; Jo, D. ; Ko, K.-H. ; Go, D.FZJ* ; Kim, K.-H. ; Park, H. G. ; Kim, C. ; Min, B.-C. ; Choi, G.-M. (Corresponding author) ; Lee, H.-W. (Corresponding author)

2023
Nature Publ. Group London [u.a.]

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Please use a persistent id in citations: doi:10.1038/s41586-023-06101-9  doi:10.34734/FZJ-2023-02639

Abstract: The orbital Hall effect1 refers to the generation of electron orbital angular momentum flow transverse to an external electric field. Contrary to the common belief that the orbital angular momentum is quenched in solids, theoretical studies2,3 predict that the orbital Hall effect can be strong and is a fundamental origin of the spin Hall effect4,5,6,7 in many transition metals. Despite the growing circumstantial evidence8,9,10,11, its direct detection remains elusive. Here we report the magneto-optical observation of the orbital Hall effect in the light metal titanium (Ti). The Kerr rotation by the orbital magnetic moment accumulated at Ti surfaces owing to the orbital Hall current is measured, and the result agrees with theoretical calculations semi-quantitatively and is supported by the orbital torque12 measurement in Ti-based magnetic heterostructures. This result confirms the orbital Hall effect and indicates that the orbital angular momentum is an important dynamic degree of freedom in solids. Moreover, this calls for renewed studies of the orbital effect on other degrees of freedom such as spin2,3,13,14, valley15,16, phonon17,18,19 and magnon20,21 dynamics.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)
2. Quanten-Theorie der Materialien (IAS-1)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)

Appears in the scientific report 2023

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