Experimental observation of Fermi-level flat band in novel kagome metal CeNi 5

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 Ferm...

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Veröffentlicht in:Chinese physics B 2024-07, Vol.33 (8), p.87402
Hauptverfasser: Chen 陈, Xue-Zhi 学智, Wang 王, Le 乐, Zhang 张, Shuai 帅, Zhang 张, Ren-Jie 任杰, Cheng 程, Yi-Wei 以伟, Hu 胡, Yu-Dong 裕栋, Meng 孟, Cheng-Nuo 承诺, Liu 刘, Zheng-Tai 正太, Lv 吕, Bai-Qing 佰晴, Huang 黄, Yao-Bo 耀波
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Sprache:eng
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Zusammenfassung: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 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 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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/ad4019