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Large anomalous Hall current induced by topological nodal lines in a ferromagnetic van der Waals semimetal
- Title
- Large anomalous Hall current induced by topological nodal lines in a ferromagnetic van der Waals semimetal
- Authors
- Kim, Kyoo; Seo, Junho; Lee, Eunwoo; Ko, K. -T.; Kim, B. S.; Jang, Bo Gyu; Ok, Jong Mok; Lee, Jinwon; Jo, Youn Jung; Kang, Woun; Shim, Ji Hoon; Kim, C.; Yeom, Han Woong; Il Min, Byung; Yang, Bohm-Jung; Kim, Jun Sung
- Ewha Authors
- 강원
- SCOPUS Author ID
- 강원
- Issue Date
- 2018
- Journal Title
- NATURE MATERIALS
- ISSN
- 1476-1122
1476-4660
- Citation
- NATURE MATERIALS vol. 17, no. 9, pp. 794 - +
- Publisher
- NATURE PUBLISHING GROUP
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Topological semimetals host electronic structures with several band-contact points or lines and are generally expected to exhibit strong topological responses. Up to now, most work has been limited to non-magnetic materials and the interplay between topology and magnetism in this class of quantum materials has been largely unexplored. Here we utilize theoretical calculations, magnetotransport and angle-resolved photoemission spectroscopy to propose Fe3GeTe2, a van der Waals material, as a candidate ferromagnetic (FM) nodal line semimetal. We find that the spin degree of freedom is fully quenched by the large FM polarization, but the line degeneracy is protected by crystalline symmetries that connect two orbitals in adjacent layers. This orbital-driven nodal line is tunable by spin orientation due to spin-orbit coupling and produces a large Berry curvature, which leads to a large anomalous Hall current, angle and factor. These results demonstrate that FM topological semimetals hold significant potential for spin-and orbital-dependent electronic functionalities.
- DOI
- 10.1038/s41563-018-0132-3
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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