Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-020-18111-6
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Funding
- Gordon and Betty Moore Foundation [GBMF4547, GBMF9461/Hasan]
- United States Department of Energy (US DOE) under the Basic Energy Sciences programme [DOE/BES DE-FG-02-05ER46200]
- Lawrence Berkeley National Laboratory
- Miller Institute of Basic Research in Science at the University of California, Berkeley
- National Natural Science Foundation of China [U1832214, 11774007, 11774423, 11822412]
- National Key R&D Program of China [2018YFA0305601, 2016YFA0300504, 2018YFE0202600]
- Chinese Academy of Sciences [XDB28000000]
- Fundamental Research Funds for the Central Universities
- Research Funds of Renmin University of China (RUC) [18XNLG14, 19XNLG17]
- U.S. Department of Energy, Basic Energy Sciences [DE-FG02-99ER45747]
- National Center for Theoretical Sciences
- Ministry of Science and Technology of Taiwan [MOST-107-2628-M-110-001-MY3, MOST-109-2112-M-001-014-MY3]
- Independent Research Fund Denmark [DFF 8021-00047B]
- [NSF-DMR-1507585]
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Quantum states induced by single-atomic impurities are at the frontier of physics and material science. While such states have been reported in high-temperature superconductors and dilute magnetic semiconductors, they are unexplored in topological magnets which can feature spin-orbit tunability. Here we use spin-polarized scanning tunneling microscopy/spectroscopy (STM/S) to study the engineered quantum impurity in a topological magnet Co3Sn2S2. We find that each substituted In impurity introduces a striking localized bound state. Our systematic magnetization-polarized probe reveals that this bound state is spin-down polarized, in lock with a negative orbital magnetization. Moreover, the magnetic bound states of neighboring impurities interact to form quantized orbitals, exhibiting an intriguing spin-orbit splitting, analogous to the splitting of the topological fermion line. Our work collectively demonstrates the strong spin-orbit effect of the single-atomic impurity at the quantum level, suggesting that a nonmagnetic impurity can introduce spin-orbit coupled magnetic resonance in topological magnets. Single-atomic impurities may induce novel quantum state, but they are unexplored in topological magnets. Here, the authors report spin-down polarized bound states which further interact with neighboring states to form spin-orbit split quantized orbitals in a topological magnet Co3Sn2S2.
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