Choi, Young-Gwan Jo, Daegeun Ko, Kyung-Hun Go, Dongwook Kim, Kyung-Han Park, Hee Gyum Kim, Changyoung Min, Byoung-Chul Choi, Gyung-Min Lee, Hyun-Woo 2024-01-19T09:03:56Z 2024-01-19T09:03:56Z 2023-08-24 2023-07 0028-0836 https://pubs.kist.re.kr/handle/201004/113494 The orbital Hall effect(1) 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 studies(2,3) predict that the orbital Hall effect can be strong and is a fundamental origin of the spin Hall effect(4-7) in many transition metals. Despite the growing circumstantial evidence(8-11), 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 torque(12) 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 spin(2,3,13,14), valley(15,16), phonon(17-19) and magnon(20,21) dynamics. English Nature Publishing Group Observation of the orbital Hall effect in a light metal Ti Article 10.1038/s41586-023-06101-9 1 Nature, v.619, no.7968, pp.52 - 56 Nature 619 7968 52 56 N scie scopus 001024763800012 2-s2.0-85164034682 Multidisciplinary Sciences Science & Technology - Other Topics Article