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Observation of the orbital Hall effect in a light metal Ti

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Title
Observation of the orbital Hall effect in a light metal Ti
Author(s)
Choi, Young-Gwan; Jo, Daegeun; Ko, Kyung-Hun; Go, Dongwook; Kim, Kyung-Han; Park, Hee Gyum; Changyoung Kim; Min, Byoung-Chul; Gyung-Min Choi; Lee, Hyun-Woo
Publication Date
2023-07
Journal
Nature, v.619, no.7968, pp.52 - 56
Publisher
Nature Research
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 effect4–7 in many transition metals. Despite the growing circumstantial evidence8–11, 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, phonon17–19 and magnon20,21 dynamics. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.
URI
https://pr.ibs.re.kr/handle/8788114/13754
DOI
10.1038/s41586-023-06101-9
ISSN
0028-0836
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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