中国物理B ›› 2024, Vol. 33 ›› Issue (8): 87402-087402.doi: 10.1088/1674-1056/ad4019

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Experimental observation of Fermi-level flat band in novel kagome metal CeNi5

Xue-Zhi Chen(陈学智)1,2,3, Le Wang(王乐)4,5, Shuai Zhang(张帅)6, Ren-Jie Zhang(张任杰)2,3,7, Yi-Wei Cheng(程以伟)1,2,3, Yu-Dong Hu(胡裕栋)2, Cheng-Nuo Meng(孟承诺)1,3, Zheng-Tai Liu(刘正太)10, Bai-Qing Lv(吕佰晴)2,8,9,†, and Yao-Bo Huang(黄耀波)10,1,3,‡   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    2 Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
    5 International Quantum Academy, Shenzhen 518048, China;
    6 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China;
    7 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    8 School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
    9 Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200240, China;
    10 Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
  • 收稿日期:2024-02-10 修回日期:2024-03-16 出版日期:2024-08-15 发布日期:2024-07-23
  • 通讯作者: Bai-Qing Lv, Yao-Bo Huang E-mail:baiqing@sjtu.edu.cn;huangyaobo@sari.ac.cn
  • 基金资助:
    Project support by the Science Fund from Shanghai Committee of Science and Technology, China (Grant No. 23JC1403300), the Shanghai Municipal Science and Technology Major Project, China, the TDLI Starting up Grant, the National Natural Science Foundation of China (Grant Nos. 12374063, 12204223, and 23Z990202580), the Fund from the Ministry of Science and Technology of China (Grant No. 2023YFA1407400), the Shanghai Natural Science Fund for Original Exploration Program, China (Grant No. 23ZR1479900), and Shanghai Talent Program, China.

Experimental observation of Fermi-level flat band in novel kagome metal CeNi5

Xue-Zhi Chen(陈学智)1,2,3, Le Wang(王乐)4,5, Shuai Zhang(张帅)6, Ren-Jie Zhang(张任杰)2,3,7, Yi-Wei Cheng(程以伟)1,2,3, Yu-Dong Hu(胡裕栋)2, Cheng-Nuo Meng(孟承诺)1,3, Zheng-Tai Liu(刘正太)10, Bai-Qing Lv(吕佰晴)2,8,9,†, and Yao-Bo Huang(黄耀波)10,1,3,‡   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    2 Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
    5 International Quantum Academy, Shenzhen 518048, China;
    6 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China;
    7 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    8 School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
    9 Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200240, China;
    10 Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
  • Received:2024-02-10 Revised:2024-03-16 Online:2024-08-15 Published:2024-07-23
  • Contact: Bai-Qing Lv, Yao-Bo Huang E-mail:baiqing@sjtu.edu.cn;huangyaobo@sari.ac.cn
  • Supported by:
    Project support by the Science Fund from Shanghai Committee of Science and Technology, China (Grant No. 23JC1403300), the Shanghai Municipal Science and Technology Major Project, China, the TDLI Starting up Grant, the National Natural Science Foundation of China (Grant Nos. 12374063, 12204223, and 23Z990202580), the Fund from the Ministry of Science and Technology of China (Grant No. 2023YFA1407400), the Shanghai Natural Science Fund for Original Exploration Program, China (Grant No. 23ZR1479900), and Shanghai Talent Program, China.

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摘要： Kagome materials are a class of material with a lattice structure composed of corner-sharing triangles that produce various exotic electronic phenomena, such as Dirac fermions, van Hove singularities, and flat bands. However, most of the known kagome materials have a flat band detached from the Fermi energy, which limits the investigation of the emergent flat band physics. In this work, by combining soft x-ray angle-resolved photoemission spectroscopy (ARPES) and the first-principles calculations, the electronic structure is investigated of a novel kagome metal CeNi$_{5}$ with a clear dispersion along the $k_{z}$ direction and a Fermi level flat band in the $\varGamma$-$K$-$M$-$\varGamma $ plane. Besides, resonant ARPES experimental results indicate that the valence state of Ce ions is close to 4$^{+}$, which is consistent with the transport measurement result. Our results demonstrate the unique electronic properties of CeNi$_{5}$ as a new kagome metal and provide an ideal platform for exploring the flat band physics and the interactions between different types of flat bands by tuning the valence state of Ce ions.

关键词: ARPES, kagome lattice, band structure, flat band

Abstract: Kagome materials are a class of material with a lattice structure composed of corner-sharing triangles that produce various exotic electronic phenomena, such as Dirac fermions, van Hove singularities, and flat bands. However, most of the known kagome materials have a flat band detached from the Fermi energy, which limits the investigation of the emergent flat band physics. In this work, by combining soft x-ray angle-resolved photoemission spectroscopy (ARPES) and the first-principles calculations, the electronic structure is investigated of a novel kagome metal CeNi$_{5}$ with a clear dispersion along the $k_{z}$ direction and a Fermi level flat band in the $\varGamma$-$K$-$M$-$\varGamma $ plane. Besides, resonant ARPES experimental results indicate that the valence state of Ce ions is close to 4$^{+}$, which is consistent with the transport measurement result. Our results demonstrate the unique electronic properties of CeNi$_{5}$ as a new kagome metal and provide an ideal platform for exploring the flat band physics and the interactions between different types of flat bands by tuning the valence state of Ce ions.

Key words: ARPES, kagome lattice, band structure, flat band

中图分类号:  (Electronic structure (photoemission, etc.))

  • 74.25.Jb
71.27.+a (Strongly correlated electron systems; heavy fermions) 73.20.-r (Electron states at surfaces and interfaces) 79.60.-i (Photoemission and photoelectron spectra)