Observation of kagome-like bands in two-dimensional semiconducting Cr8Se12
The kagome lattice is a versatile platform for investigating correlated electronic states. However, its realization in two-dimensional (2D) semiconductors for tunable device applications is still challenging. An alternative strategy to create kagome-like bands is to realize a coloring-triangle (CT) lattice in semiconductors through a distortion of a modified triangular lattice. Here, we report the observation of low-energy kagome-like bands in a semiconducting 2D transition metal chalcogenide-Cr<sub>8</sub>Se<sub>12</sub> with a thickness of 7 atomic layers-which exhibits a CT lattice and a bandgap of 0.8 eV. The Cr-deficient layer beneath the topmost Se-full layer is partially occupied with 2/3 occupancy, yielding a √3 × √3 Cr honeycomb network. Angle-resolved photoemission spectroscopy measurements and first-principles investigations reveal the surface kagome-like bands near the valence band maximum, which are attributed to topmost Se p<sub>z</sub> orbitals modulated by the honeycomb Cr.
Authors
- Siew Lang Teo (ORCID: https://orcid.org/0000-0001-8938-2495)
- Yihe Wang (ORCID: https://orcid.org/0000-0002-6671-5581)
- Sisheng Duan (ORCID: https://orcid.org/0009-0001-3297-5238)
- Baojie Feng (ORCID: https://orcid.org/0000-0003-2332-7949)
- Shuo Sun (ORCID: https://orcid.org/0000-0001-6092-7148)
- Ming Lin (ORCID: https://orcid.org/0000-0001-5284-6591)
- Jing‐Yang You (ORCID: https://orcid.org/0000-0003-4559-6592)
- Jian Gou (ORCID: https://orcid.org/0000-0001-8779-6491)
- Yu Huang (ORCID: https://orcid.org/0000-0003-3699-4708)
- Andrew T. S. Wee (ORCID: https://orcid.org/0000-0002-5828-4312)
- Wei Chen (ORCID: https://orcid.org/0000-0002-1131-3585)
- Chun Zhang (ORCID: https://orcid.org/0000-0002-1581-5806)
- Xiaojiang Yu (ORCID: https://orcid.org/0000-0002-7044-6417)
- Zhihao Cai
- Dong Sheng Li
Institutions
- Shanghai University (CN)
- Agency for Science, Technology and Research (SG)
- Tianjin University (CN)
- National University of Singapore (SG)
- Institute of Materials Research and Engineering (SG)
- Suzhou Research Institute (CN)
- Institute of Physics (CN)
- University of Chinese Academy of Sciences (CN)
- Zhejiang University (CN)
Publication Details
- Journal
- Nature Communications
- Published
- 2024-10-16
- DOI
- https://doi.org/10.1038/s41467-024-53314-1
- Citations
- 8
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.94
Funders
- National Research Foundation
- Agency for Science, Technology and Research
- National Research Foundation Singapore
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Natural Science Foundation of Fujian Province
- Ministry of Education, India
- Southern University of Science and Technology