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 kz direction and a Fermi level flat band in theΓ–K–M–Γplane.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.
作者
陈学智
王乐
张帅
张任杰
程以伟
胡裕栋
孟承诺
刘正太
吕佰晴
黄耀波
Xue-Zhi Chen;Le Wang;Shuai Zhang;Ren-Jie Zhang;Yi-Wei Cheng;Yu-Dong Hu;Cheng-Nuo Meng;Zheng-Tai Liu;Bai-Qing Lv;Yao-Bo Huang(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;Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;International Quantum Academy,Shenzhen 518048,China;Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,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;Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China)
基金
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)
Shanghai Talent Program,China。
