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

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外文摘要：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 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.

外文关键词：

ARPESkagome latticeband structureflat band

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

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作者单位：

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

Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,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

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基金：

Science Fund from Shanghai Committee of Science and Technology,ChinaShanghai Municipal Science and Technology Major Project,ChinaTDLI Starting up GrantNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFund from the Ministry of Science and Technology of ChinaShanghai Natural science Fund for Original Exploration Program,ChinaShanghai Talent Program,China

项目编号：

23JC1403300123740631220422323Z9902025802023YFA140740023ZR1479900

出版年：

2024

DOI：

10.1088/1674-1056/ad4019

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

年,卷(期)：2024.33(8)