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<p>The interplay between local and itinerant electrons underpins many correlated and topological quantum states. Kagome lattices provide an ideal platform by hosting both flat (localized states) and dispersive bands (itinerant states), yet direct spectroscopic evidence of their dynamical coupling has remained elusive. Here we report the long-sought flat band resonance in the quasi-two-dimensional kagome bilayer material CsCr₆Sb₆. Using angle-resolved photoemission spectroscopy, transport measurements, and combined density functional theory and dynamical mean-field theory, we identify coexisting flat band doublets and dispersive bands near the Fermi energy. Upon cooling, the flat and dispersive bands exhibit a pronounced enhancement of spectral weight and hybridization, directly evidencing flat band resonance. Crucially, this emergence coincides with the onset of short-range antiferromagnetic correlations, contrasting sharply with conventional Kondo lattice behavior. Our findings demonstrate not only the long-sought flat band resonance in kagome materials, but also its unconventional correlation with magnetism.</p>

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Observation of resonance of kagome flat band doublet

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月16日

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  • Renjie Zhang,
  • Bei Jiang,
  • Xiangqi Liu,
  • Hengxin Tan,
  • Xuefeng Zhang,
  • Mojun Pan,
  • Quanxin Hu,
  • Yiwei Cheng,
  • Chengnuo Meng,
  • Yudong Hu,
  • Yufan Zhao,
  • Runze Wang,
  • Dupeng Zhang,
  • Junqin Li,
  • Zhengtai Liu,
  • Mao Ye,
  • Ziqiang Wang,
  • Yaobo Huang,
  • Gang Li,
  • Yanfeng Guo,
  • Hong Ding,
  • Baiqing Lv

摘要

The interplay between local and itinerant electrons underpins many correlated and topological quantum states. Kagome lattices provide an ideal platform by hosting both flat (localized states) and dispersive bands (itinerant states), yet direct spectroscopic evidence of their dynamical coupling has remained elusive. Here we report the long-sought flat band resonance in the quasi-two-dimensional kagome bilayer material CsCr₆Sb₆. Using angle-resolved photoemission spectroscopy, transport measurements, and combined density functional theory and dynamical mean-field theory, we identify coexisting flat band doublets and dispersive bands near the Fermi energy. Upon cooling, the flat and dispersive bands exhibit a pronounced enhancement of spectral weight and hybridization, directly evidencing flat band resonance. Crucially, this emergence coincides with the onset of short-range antiferromagnetic correlations, contrasting sharply with conventional Kondo lattice behavior. Our findings demonstrate not only the long-sought flat band resonance in kagome materials, but also its unconventional correlation with magnetism.