Quantum-limit Chern topological magnetism in TbMn6Sn6.

Nature
Jia-Xin YinM Zahid Hasan

Abstract

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 ra...Continue Reading

References

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Citations

Sep 6, 2020·Nature Communications·Jia-Xin YinM Zahid Hasan
Jan 20, 2021·Nature·Youngjoon ChoiStevan Nadj-Perge
Apr 14, 2021·Scientific Reports·Shamiul AlamAhmedullah Aziz
May 27, 2021·Nature Communications·Man LiShancai Wang
Jun 12, 2021·Nature Materials·Yu-Xiao JiangM Zahid Hasan
Jul 3, 2021·Physical Review Letters·Wenlong MaShuang Jia
Oct 6, 2021·Nano Letters·Run-Wu ZhangYugui Yao

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Methods Mentioned

BETA
transmission electron microscopy
transmission
X-ray

Software Mentioned

HIVE

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