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

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [1];  [3];  [3];  [4];  [4];  [5];  [5];  [6];  [7];  [2];  [2];  [8];  [9];  [2];  [1];  [1];  [1] more »;  [1];  [2];  [2];  [10] « less
  1. Princeton University, NJ (United States)
  2. Rice University, Houston, TX (United States)
  3. National Cheng Kung University, Tainan (Taiwan)
  4. Huazhong University of Science and Technology, Wuhan (China)
  5. University of Zurich (Switzerland)
  6. Massachusetts Institute of Technology, Cambridge, MA (United States)
  7. Southern University of Science and Technology, Guangdong (China)
  8. Nanyang Technological University (Singapore)
  9. Paul Scherrer Institute, Villigen PSI (Switzerland)
  10. Princeton University, NJ (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Quantum Science Center, Oak Ridge, TN (United States)
+ Show Author Affiliations
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 2×2 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. Here, we discuss our results with the theoretically considered topological features of the kagome charge order including unconventional magnetism and bulk-boundary correspondence.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); National Quantum Information Science (QIS) Research Centers (United States). Quantum Science Center; Rice University, Houston, TX (United States)
Sponsoring Organization:
Gordon and Betty Moore Foundation (GBMF); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); National Research Foundation, Singapore; National Science Foundation (NSF); Robert A. Welch Foundation; South University of Science and Technology of China; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH11231; FG02-05ER46200; SC0018197; SC0021421
OSTI ID:
2962174
Alternate ID(s):
OSTI ID: 1994356
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 129; ISSN 1079-7114; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
Charge density waves
Density of states
Edge states
Electronic structure
Topological materials
charge density waves
density of states
edge states
electronic structure
topological materials