Observation of kagome-like bands in two-dimensional semiconducting Cr 8 Se 12

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)...

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Published in:Nature communications 2024-10, Vol.15 (1), p.8940
Main Authors: Duan, Sisheng, You, Jing-Yang, Cai, Zhihao, Gou, Jian, Li, Dong, Huang, Yu Li, Yu, Xiaojiang, Teo, Siew Lang, Sun, Shuo, Wang, Yihe, Lin, Ming, Zhang, Chun, Feng, Baojie, Wee, Andrew T S, Chen, Wei
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Language:English
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Summary: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 Se 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 orbitals modulated by the honeycomb Cr.
ISSN:2041-1723