4.8 Article

Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

期刊

PHYSICAL REVIEW LETTERS
卷 129, 期 16, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.129.166401

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资金

  1. U.S. Departmentof Energy, Office of Science, National Quantum Information Science Research Centers
  2. Quantum Science Center
  3. Gordon and Betty Moore Foundation [GBMF9461, GBMF4547]
  4. U.S. DOE under the Basic Energy Sciences program [DOE/BES DE-FG-02-05ER46200]
  5. Young Scholar Fellowship Program under a MOST grant for the Columbus Program [MOST111-2636-M-006-014]
  6. Higher Education Sprout Project
  7. Ministry of Education
  8. National Center for Theoretical Sciences (Taiwan)
  9. U.S. NSF [DMR-2100741]
  10. Robert A.Welch Foundation [C-1839, C-2024, C-1411]
  11. U.S. Department Of Energy (DOE) [DE-SC0021421, DE-SC0018197]
  12. Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF9470]
  13. National Research Foundation, Singapore [NRF-NRFF13-2021-0010]
  14. European Union [ERC-StG-Neupert-757867-PARATOP]
  15. National Key Research and Development Program of China [2018YFA0307000]
  16. National Natural Science Foundation of China [11874022]
  17. South University of Science and Technology of China [Y01202500]
  18. Princeton University
  19. U.S. Department of Energy (DOE) [DE-SC0018197, DE-SC0021421] Funding Source: U.S. Department of Energy (DOE)

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This study explores the charge order in the kagome lattice of FeGe through tunneling, revealing a 2 x 2 charge order and uncovering its correlation with antiferromagnetism and charge order anisotropy. Additionally, the study detects a pronounced edge state within the charge order energy gap.
Kagome materials often host exotic quantum phases, including spin liquids, Chern gap, charge density wave, and superconductivity. Existing scanning microscopy studies of the kagome charge order have been limited to nonkagome surface layers. Here, we tunnel into the kagome lattice of FeGe to uncover features of the charge order. Our spectroscopic imaging identifies a 2 x 2 charge order in the magnetic kagome lattice, resembling that discovered in kagome superconductors. Spin mapping across steps of unit cell height demonstrates the existence of spin-polarized electrons with an antiferromagnetic stacking order. We further uncover the correlation between antiferromagnetism and charge order anisotropy, highlighting the unusual magnetic coupling of the charge order. Finally, we detect a pronounced edge state within the charge order energy gap, which is robust against the irregular shape fluctuations of the kagome lattice edges. We discuss our results with the theoretically considered topological features of the kagome charge order including unconventional magnetism and bulk-boundary correspondence.

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