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Magnetism and charge density wave order in kagome FeGe

Journal Article · · Nature Physics
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [6];  [7];  [7];  [8];  [8];  [8];  [9];  [3];  [10];  [4];  [4]
  1. Rice University, Houston, TX (United States); SLAC
  2. Rice University, Houston, TX (United States); University of California, Berkeley, CA (United States)
  3. Weizmann Institute of Science, Rehovot (Israel)
  4. Rice University, Houston, TX (United States)
  5. Southern University of Science and Technology, Shenzhen (China)
  6. University of Washington, Seattle, WA (United States)
  7. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  8. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  9. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  10. University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations

Electron correlations often lead to emergent orders in quantum materials, and one example is the kagome lattice materials where topological states exist in the presence of strong correlations between electrons. This arises from the features of the electronic band structure that are associated with the kagome lattice geometry: flat bands induced by destructive interference of the electronic wavefunctions, topological Dirac crossings and a pair of van Hove singularities. Various correlated electronic phases have been discovered in kagome lattice materials, including magnetism, charge density waves, nematicity and superconductivity. Recently, a charge density wave was discovered in the magnetic kagome FeGe, providing a platform for understanding the interplay between charge order and magnetism in kagome materials. Here we observe all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy. The presence of van Hove singularities near the Fermi level is driven by the underlying magnetic exchange splitting. Furthermore, we show spectral evidence for the charge density wave as gaps near the Fermi level. In conclusion, our observations point to the magnetic interaction-driven band modification resulting in the formation of the charge density wave and indicate an intertwined connection between the emergent magnetism and charge order in this moderately correlated kagome metal.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); Gordon and Betty Moore Foundation; Robert A. Welch Foundation; National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231; SC0021421
OSTI ID:
2001283
Alternate ID(s):
OSTI ID: 2229297
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 6 Vol. 19; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Electronic properties and materials
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