Large anomalous Hall current induced by topological nodal lines in a ferromagnetic van der Waals semimetal

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Title
Large anomalous Hall current induced by topological nodal lines in a ferromagnetic van der Waals semimetal
Author(s)
Kyoo Kim; Junho Seo; Eunwoo Lee; K.-T. Ko; B. S. Kim; Bo Gyu Jang; Jong Mok Ok; Jinwon Lee; Youn Jung Jo; Woun Kang; Ji Hoon Shim; C. Kim; Han Woong Yeom; Byung Il Min; Bohm-Jung Yang; Jun Sung Kim
Publication Date
2018-07
Journal
NATURE MATERIALS, v.17, no.9, pp.794 - 799
Publisher
NATURE PUBLISHING GROUP
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. (c)2018,The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/5261
ISSN
1476-1122
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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