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Discovery of a quantum limit Chern magnet TbMn6Sn6

Authors :
Yin, Jia-Xin
Ma, Wenlong
Cochran, Tyler A.
Xu, Xitong
Zhang, Songtian S.
Tien, Hung-Ju
Shumiya, Nana
Cheng, Guangming
Jiang, Kun
Lian, Biao
Song, Zhida
Chang, Guoqing
Belopolski, Ilya
Multer, Daniel
Litskevich, Maksim
Cheng, Zijia
Yang, Xian
Swidler, Bianca
Zhou, Huibin
Lin, Hsin
Neupert, Titus
Wang, Ziqiang
Yao, Nan
Chang, Tay-Rong
Jia, Shuang
Hasan, M. Zahid
Source :
Nature 583, 533-536 (2020)
Publication Year :
2020

Abstract

The quantum level interplay between geometry, topology, and correlation is at the forefront of fundamental physics. Owing to the unusual lattice geometry and breaking of time-reversal symmetry, kagome magnets are predicted to support intrinsic Chern quantum phases. However, quantum materials hosting ideal spin-orbit coupled kagome lattices with strong out-of-plane magnetization have been lacking. Here we use scanning tunneling microscopy to discover a new topological kagome magnet TbMn6Sn6, which is close to satisfying the above criteria. We visualize its effectively defect-free purely Mn-based ferromagnetic kagome lattice with atomic resolution. Remarkably, its electronic state exhibits distinct Landau quantization upon the 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 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, opening up an avenue for discovering topological quantum phenomena in the RMn6Sn6 (R = rare earth element) family with a variety of magnetic structures. Our visualization of the magnetic bulk-boundary-Berry correspondence covering real and momentum space demonstrates a proof-of-principle method revealing topological magnets.<br />Comment: To appear in Nature (2020)

Details

Database :
arXiv
Journal :
Nature 583, 533-536 (2020)
Publication Type :
Report
Accession number :
edsarx.2006.04881
Document Type :
Working Paper
Full Text :
https://doi.org/10.1038/s41586-020-2482-7