Harnessing Van Hove singularities for terahertz photoresponse via Fermi surface reconstruction in kagome lattices
The trihexagonal tiling system exhibits strong electron-electron interactions, positioning it as a key condensed matter platform for studying geometrically frustrated lattices made up of corner-sharing triangles. Its phase-transition-driven lattice modulations enable Fermi surface reconstruction, while emergent van Hove singularities near the Fermi level and correlated band anomalies present critical challenges in understanding electronic interaction mechanisms. By combining temperature-dependent spectroscopy, angle-resolved photoemission, and density functional theory calculations, we demonstrate a 61-fold enhancement in terahertz direct detection mode, ultra-low noise (1.38 × 10⁻²⁵ A²/Hz) below phase transition temperature, and broadband operation up to 100 GHz in beat-note heterodyne mode. These results are directly correlated with the Fermi surface reconstruction induced by phase transitions. This work positions geometrically frustrated lattices as a powerful platform for studying correlated quantum phenomena, offering new pathways for the design of advanced quantum devices.
Authors
- Yingdong Wei (ORCID: https://orcid.org/0000-0002-5749-9733)
- Weida Hu
- Shiqi Lan (ORCID: https://orcid.org/0009-0008-9869-4632)
- Ke Qu (ORCID: https://orcid.org/0000-0001-7794-3697)
- Taikang Chen (ORCID: https://orcid.org/0000-0001-9891-1571)
- Xiao Zhuo
- Yichong Zhang
- Shi Zhang
- Zhen Hu
- Xiaokai Pan
- Yage Yang
- Yanfeng Guo
- Libo Zhang
- Fang Wang
- Yanlin Wu
- Dawei Shen (ORCID: https://orcid.org/0000-0003-2402-7956)
- Li Han
- Lin Wang
- Xun Ge
- Xiaoshuang Chen
- Wei Ren (ORCID: https://orcid.org/0000-0001-7317-3867)
- Wei Lu
Institutions
- Chinese Academy of Sciences (CN)
- ShanghaiTech University (CN)
- Chinese National Human Genome Center at Shanghai (CN)
- Suzhou Research Institute (CN)
- Shanghai Institute of Technical Physics (CN)
- Shanghai Institute of Microsystem and Information Technology (CN)
- Shanghai Research Institute of Materials (CN)
- University of Chinese Academy of Sciences (CN)
- China Jiliang University (CN)
Publication Details
- Journal
- Nature Communications
- Published
- 2026-01-22
- DOI
- https://doi.org/10.1038/s41467-025-66749-x
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Natural Science Foundation of Shanghai
- Innovative Research Group Project of the National Natural Science Foundation of China
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Shanghai Rising-Star Program