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

Chen, Xue-Zhi1,2,3; Wang, Le4,5; Zhang, Shuai6; Zhang, Ren-Jie2,3,7,8; Cheng, Yi-Wei1,2,3; Hu, Yu-Dong2; Meng, Cheng-Nuo1,3; Liu, Zheng-Tai11; Lv, Bai-Qing2,9,10; Huang, Yao-Bo1,3,11

2024-07-01

10.1088/1674-1056/ad4019

CHINESE PHYSICS B   影响因子和分区

1674-1056

2058-3834

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 CeNi5 with a clear dispersion along the kz direction and a Fermi level flat band in the Gamma-K-M-Gamma 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 CeNi5 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.

ARPES kagome lattice band structure flat band

SCI ; EI

英语

其他

Science Fund from Shanghai Committee of Science and Technology, China[23JC1403300] ; National Natural Science Foundation of China["12374063","12204223","23Z990202580"] ; Fund from the Ministry of Science and Technology of China[2023YFA1407400] ; Shanghai Natural Science Fund for Original Exploration Program, China[23ZR1479900]

Physics

Physics, Multidisciplinary

WOS:001280146400001

IOP Publishing Ltd

Web of Science

1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
2.Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
5.Int Quantum Acad, Shenzhen 518048, Peoples R China
6.Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
7.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
8.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
9.Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China
10.Shanghai Jiao Tong Univ, Zhangjiang Inst Adv Study, Shanghai 200240, Peoples R China
11.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

Chen, Xue-Zhi,Wang, Le,Zhang, Shuai,et al. Experimental observation of Fermi-level flat band in novel kagome metal CeNi₅[J]. CHINESE PHYSICS B,2024,33(8).

Chen, Xue-Zhi.,Wang, Le.,Zhang, Shuai.,Zhang, Ren-Jie.,Cheng, Yi-Wei.,...&Huang, Yao-Bo.(2024).Experimental observation of Fermi-level flat band in novel kagome metal CeNi₅.CHINESE PHYSICS B,33(8).

Chen, Xue-Zhi,et al."Experimental observation of Fermi-level flat band in novel kagome metal CeNi₅".CHINESE PHYSICS B 33.8(2024).