Large anomalous Hall current induced by topological nodal lines in a ferromagnetic van der Waals semimetal
- 주제(기타) Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
- 설명문(일반) [Kim, Kyoo; Seo, Junho; Ko, K. -T.; Ok, Jong Mok; Lee, Jinwon; Yeom, Han Woong; Il Min, Byung; Kim, Jun Sung] Pohang Univ Sci & Technol, Dept Phys, Pohang, South Korea; [Kim, Kyoo; Ko, K. -T.] Pohang Univ Sci & Technol, Max Planck POSTECH, Hsinchu Ctr Complex Phase Mat, Pohang, South Korea; [Seo, Junho; Ok, Jong Mok; Lee, Jinwon; Yeom, Han Woong; Kim, Jun Sung] Inst for Basic Sci Korea, Ctr Artificial Low Dimens Elect Syst, Pohang, South Korea; [Lee, Eunwoo; Kim, B. S.; Kim, C.; Yang, Bohm-Jung] Seoul Natl Univ, Dept Phys & Astron, Seoul, South Korea; [Lee, Eunwoo; Kim, B. S.; Kim, C.; Yang, Bohm-Jung] Inst for Basic Sci Korea, Ctr Correlated Electron Syst, Seoul, South Korea; [Lee, Eunwoo; Yang, Bohm-Jung] Seoul Natl Univ, CTP, Seoul, South Korea; [Jang, Bo Gyu; Shim, Ji Hoon] Pohang Univ Sci & Technol, Dept Chem, Pohang, South Korea; [Jo, Youn Jung] Kyungpook Natl Univ, Dept Phys, Daegu, South Korea; [Kang, Woun] Ewha Womans Univ, Dept Phys, Seoul, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 NATURE PUBLISHING GROUP
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000155646
- 본문언어 영어
- Published As http://dx.doi.org/10.1038/s41563-018-0132-3
초록/요약
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.
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