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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 K.Seo J.Lee E.Ko K.-T.Kim B.S.Jang B.G.Ok J.M.Lee J.Jo Y.J.Kang W.Shim J.H.Kim C.Yeom H.W.Il Min B.Yang B.-J.Kim J.S.
Ewha Authors
강원
SCOPUS Author ID
강원scopus
Issue Date
2018
Journal Title
Nature Materials
ISSN
1476-1122JCR Link
Citation
vol. 17, no. 9, pp. 794 - 799
Publisher
Nature Publishing Group
Indexed
SCI; SCIE; SCOPUS WOS scopus
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. © 2018, The Author(s).
DOI
10.1038/s41563-018-0132-3
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자연과학대학 > 물리학전공 > Journal papers
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