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

陈学智 ¹王乐 ²张帅 ³张任杰 ⁴程以伟 ¹胡裕栋 ⁵孟承诺 ⁶刘正太 ⁷吕佰晴 ⁸黄耀波⁹

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作者信息

1. Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China;University of Chinese Academy of Sciences,Beijing 100049,China
2. Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;International Quantum Academy,Shenzhen 518048,China
3. Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China
4. Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China;University of Chinese Academy of Sciences,Beijing 100049,China;Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
5. Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China
6. Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China
7. Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China
8. Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China;School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Zhangjiang Institute for Advanced Study,Shanghai Jiao Tong University,Shanghai 200240,China
9. Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China
折叠

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

Key words

ARPES/kagome lattice/band structure/flat band

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基金项目

Science Fund from Shanghai Committee of Science and Technology,China(23JC1403300)

Shanghai Municipal Science and Technology Major Project,China()

TDLI Starting up Grant()

National Natural Science Foundation of China(12374063)

National Natural Science Foundation of China(12204223)

National Natural Science Foundation of China(23Z990202580)

Fund from the Ministry of Science and Technology of China(2023YFA1407400)

Shanghai Natural science Fund for Original Exploration Program,China(23ZR1479900)

Shanghai Talent Program,China()

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

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