Discovery and construction of surface kagome electronic states induced by p-d electronic hybridization in Co3Sn2S2

Li Huang, Xianghua Kong, Qi Zheng, Yuqing Xing, Hui Chen, Yan Li, Zhixin Hu, Shiyu Zhu, Jingsi Qiao, Yu-Yang Zhang, Haixia Cheng, Zhihai Cheng, Xianggang Qiu, Enke Liu, Hechang Lei, Xiao Lin, Ziqiang Wang, Haitao Yang (), Wei Ji () and Hong-Jun Gao ()
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Li Huang: Chinese Academy of Sciences
Xianghua Kong: Shenzhen University
Qi Zheng: Chinese Academy of Sciences
Yuqing Xing: Chinese Academy of Sciences
Hui Chen: Chinese Academy of Sciences
Yan Li: Chinese Academy of Sciences
Zhixin Hu: Tianjin University
Shiyu Zhu: Chinese Academy of Sciences
Jingsi Qiao: Renmin University of China
Yu-Yang Zhang: University of Chinese Academy of Sciences
Haixia Cheng: Renmin University of China
Zhihai Cheng: Renmin University of China
Xianggang Qiu: Chinese Academy of Sciences
Enke Liu: Chinese Academy of Sciences
Hechang Lei: Renmin University of China
Xiao Lin: University of Chinese Academy of Sciences
Ziqiang Wang: Boston College
Haitao Yang: Chinese Academy of Sciences
Wei Ji: Renmin University of China
Hong-Jun Gao: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-40942-2

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