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Observation of the orbital Hall effect in a light metal Ti

Author

Listed:
  • Young-Gwan Choi

    (Sungkyunkwan University)

  • Daegeun Jo

    (Pohang University of Science and Technology)

  • Kyung-Hun Ko

    (Sungkyunkwan University)

  • Dongwook Go

    (Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA
    Johannes Gutenberg University Mainz)

  • Kyung-Han Kim

    (Pohang University of Science and Technology)

  • Hee Gyum Park

    (Center for Spintronics, Korea Institute of Science and Technology)

  • Changyoung Kim

    (Seoul National University
    Center for Correlated Electron Systems, Institute for Basic Science)

  • Byoung-Chul Min

    (Center for Spintronics, Korea Institute of Science and Technology)

  • Gyung-Min Choi

    (Sungkyunkwan University
    Center for Integrated Nanostructure Physics, Institute for Basic Science)

  • Hyun-Woo Lee

    (Pohang University of Science and Technology
    Asia Pacific Center for Theoretical Physics)

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.

Suggested Citation

  • Young-Gwan Choi & Daegeun Jo & Kyung-Hun Ko & Dongwook Go & Kyung-Han Kim & Hee Gyum Park & Changyoung Kim & Byoung-Chul Min & Gyung-Min Choi & Hyun-Woo Lee, 2023. "Observation of the orbital Hall effect in a light metal Ti," Nature, Nature, vol. 619(7968), pages 52-56, July.
    • Handle: RePEc:nat:nature:v:619:y:2023:i:7968:d:10.1038_s41586-023-06101-9
    DOI: 10.1038/s41586-023-06101-9
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    Cited by:

    1. Yong Xu & Fan Zhang & Albert Fert & Henri-Yves Jaffres & Yongshan Liu & Renyou Xu & Yuhao Jiang & Houyi Cheng & Weisheng Zhao, 2024. "Orbitronics: light-induced orbital currents in Ni studied by terahertz emission experiments," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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