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- Title
Discovery and construction of surface kagome electronic states induced by p-d electronic hybridization in Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub>.
- Authors
Huang, Li; Kong, Xianghua; Zheng, Qi; Xing, Yuqing; Chen, Hui; Li, Yan; Hu, Zhixin; Zhu, Shiyu; Qiao, Jingsi; Zhang, Yu-Yang; Cheng, Haixia; Cheng, Zhihai; Qiu, Xianggang; Liu, Enke; Lei, Hechang; Lin, Xiao; Wang, Ziqiang; Yang, Haitao; Ji, Wei; Gao, Hong-Jun
- Abstract
Kagome-lattice materials possess attractive properties for quantum computing applications, but their synthesis remains challenging. Herein, based on the compelling identification of the two cleavable surfaces of Co3Sn2S2, we show surface kagome electronic states (SKESs) on a Sn-terminated triangular Co3Sn2S2 surface. Such SKESs are imprinted by vertical p-d electronic hybridization between the surface Sn (subsurface S) atoms and the buried Co kagome-lattice network in the Co3Sn layer under the surface. Owing to the subsequent lateral hybridization of the Sn and S atoms in a corner-sharing manner, the kagome symmetry and topological electronic properties of the Co3Sn layer is proximate to the Sn surface. The SKESs and both hybridizations were verified via qPlus non-contact atomic force microscopy (nc-AFM) and density functional theory calculations. The construction of SKESs with tunable properties can be achieved by the atomic substitution of surface Sn (subsurface S) with other group III-V elements (Se or Te), which was demonstrated theoretically. This work exhibits the powerful capacity of nc-AFM in characterizing localized topological states and reveals the strategy for synthesis of large-area transition-metal-based kagome-lattice materials using conventional surface deposition techniques. Kagome materials host 2D planes which give rise to kagome physics, but these are typically embedded in the bulk. Huang et al. demonstrate a strategy for generating surface kagome electronic states by vertical p-d electronic hybridization between surface atoms and the buried Co kagome network in Co3Sn2S2.
- Subjects
ORBITAL hybridization; ATOMIC force microscopy; SEMIMETALS; DENSITY functional theory; QUANTUM computing; TOPOLOGICAL property
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-40942-2