Quantum-limit Chern topological magnetism in TbMn6Sn6.
- Yin JX Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA. jiaxiny@princeton.edu.
- Ma W International Center for Quantum Materials, School of Physics, Peking University, Beijing, China.
- Cochran TA Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Xu X International Center for Quantum Materials, School of Physics, Peking University, Beijing, China.
- Zhang SS Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Tien HJ Department of Physics, National Cheng Kung University, Tainan, Taiwan.
- Shumiya N Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Cheng G Princeton Institute for Science and Technology of Materials, Princeton University, Princeton, NJ, USA.
- Jiang K Department of Physics, Boston College, Chestnut Hill, MA, USA.
- Lian B Princeton Center for Theoretical Science, Princeton University, Princeton, NJ, USA.
- Song Z Department of Physics, Princeton University, Princeton, NJ, USA.
- Chang G Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Belopolski I Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Multer D Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Litskevich M Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Cheng ZJ Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Yang XP Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Swidler B Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA.
- Zhou H International Center for Quantum Materials, School of Physics, Peking University, Beijing, China.
- Lin H Institute of Physics, Academia Sinica, Taipei, Taiwan.
- Neupert T Department of Physics, University of Zurich, Zurich, Switzerland.
- Wang Z Department of Physics, Boston College, Chestnut Hill, MA, USA.
- Yao N Princeton Institute for Science and Technology of Materials, Princeton University, Princeton, NJ, USA.
- Chang TR Department of Physics, National Cheng Kung University, Tainan, Taiwan.
- Jia S International Center for Quantum Materials, School of Physics, Peking University, Beijing, China. gwljiashuang@pku.edu.cn.
- Zahid Hasan M Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, USA. mzhasan@princeton.edu.
- 2020-07-24
Published in:
- Nature. - 2020
English
The quantum-level interplay between geometry, topology and correlation is at the forefront of fundamental physics1-15. Kagome magnets are predicted to support intrinsic Chern quantum phases owing to their unusual lattice geometry and breaking of time-reversal symmetry14,15. However, quantum materials hosting ideal spin-orbit-coupled kagome lattices with strong out-of-plane magnetization are lacking16-21. Here, using scanning tunnelling microscopy, we identify a new topological kagome magnet, TbMn6Sn6, that is close to satisfying these criteria. We visualize its effectively defect-free, purely manganese-based ferromagnetic kagome lattice with atomic resolution. Remarkably, its electronic state shows distinct Landau quantization on application of a magnetic field, and the quantized Landau fan structure features spin-polarized Dirac dispersion with a large Chern gap. We further demonstrate the bulk-boundary correspondence between the Chern gap and the topological edge state, as well as the Berry curvature field correspondence of Chern gapped Dirac fermions. Our results point to the realization of a quantum-limit Chern phase in TbMn6Sn6, and may enable the observation of topological quantum phenomena in the RMn6Sn6 (where R is a rare earth element) family with a variety of magnetic structures. Our visualization of the magnetic bulk-boundary-Berry correspondence covering real space and momentum space demonstrates a proof-of-principle method for revealing topological magnets.
- Language
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- English
- Open access status
- green
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- DOI 10.1038/s41586-020-2482-7
- PMID 32699400
- Persistent URL
- https://folia.unifr.ch/global/documents/195710
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