期刊
NATURE PHYSICS
卷 15, 期 5, 页码 443-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41567-019-0426-7
关键词
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资金
- Gordon and Betty Moore Foundation [GBMF4547]
- United States Department of Energy (US DOE) [DOE/BES DE-FG-02-05ER46200]
- Ministry of Science and Technology of China [2016YFA0300504]
- National Natural Science Foundation of China [11574394, 11774423, 11822412]
- Fundamental Research Funds for the Central Universities
- Renmin University of China [15XNLF06, 15XNLQ07, 18XNLG14]
- European Union's Horizon 2020 research and innovation programme [ERC-StG-Neupert-757867-PARATOP]
- US DOE [DE-FG02-99ER45747]
- Natural Science Foundation of China [11790313, 11774007]
- Key Research Program of the Chinese Academy of Sciences [XDPB08-1]
- National Key R&D Program of China [2016YFA0300403, 2018YFA035601]
- Lawrence Berkeley National Laboratory
- Miller Institute of Basic Research in Science at the University of California, Berkeley
Electronic systems with flat bands are predicted to be a fertile ground for hosting emergent phenomena including unconventional magnetism and superconductivity(1-15), but materials that manifest this feature are rare. Here, we use scanning tunnelling microscopy to elucidate the atomically resolved electronic states and their magnetic response in the kagome magnet Co3Sn2S2 (refs.(16-20)). We observe a pronounced peak at the Fermi level, which we identify as arising from the kinetically frustrated kagome flat band. On increasing the magnetic field up to +/- 8 T, this state exhibits an anomalous magnetizationpolarized many-body Zeeman shift, dominated by an orbital moment that is opposite to the field direction. Such negative magnetism is induced by spin-orbit-coupling quantum phase effects(21-25) tied to non-trivial flat band systems. We image the flat band peak, resolve the associated negative magnetism and provide its connection to the Berry curvature field, showing that Co3Sn2S2 is a rare example of a kagome magnet where the low-energy physics can be dominated by the spin-orbit-coupled flat band.
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