Observation of Resonance of Kagome Flat Band Doublet
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912973825507328 |
|---|---|
| author | Zhang, Renjie Jiang, Bei Liu, Xiangqi Tan, Hengxin Zhang, Xuefeng Pan, Mojun Hu, Quanxin Cheng, Yiwei Meng, Chengnuo Hu, Yudong Zhao, Yufan Wang, Runze Zhang, Dupeng Li, Junqin Liu, Zhengtai Ye, Mao Wang, Ziqiang Huang, Yaobo Li, Gang Guo, Yanfeng Ding, Hong Lv, Baiqing |
| author_facet | Zhang, Renjie Jiang, Bei Liu, Xiangqi Tan, Hengxin Zhang, Xuefeng Pan, Mojun Hu, Quanxin Cheng, Yiwei Meng, Chengnuo Hu, Yudong Zhao, Yufan Wang, Runze Zhang, Dupeng Li, Junqin Liu, Zhengtai Ye, Mao Wang, Ziqiang Huang, Yaobo Li, Gang Guo, Yanfeng Ding, Hong Lv, Baiqing |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_18537 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Observation of Resonance of Kagome Flat Band Doublet Zhang, Renjie Jiang, Bei Liu, Xiangqi Tan, Hengxin Zhang, Xuefeng Pan, Mojun Hu, Quanxin Cheng, Yiwei Meng, Chengnuo Hu, Yudong Zhao, Yufan Wang, Runze Zhang, Dupeng Li, Junqin Liu, Zhengtai Ye, Mao Wang, Ziqiang Huang, Yaobo Li, Gang Guo, Yanfeng Ding, Hong Lv, Baiqing Strongly Correlated Electrons 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. |
| title | Observation of Resonance of Kagome Flat Band Doublet |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.18537 |