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

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-04-18 DOI:10.1088/1674-1056/ad4019

Xuezhi Chen, Le Wang, Shuai Zhang, Renjie Zhang, Yiwei Cheng, Yudong Hu, Chengnuo Meng, Zhengtai Liu, Baiqing Lv, Yaobo Huang

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Abstract

Kagome materials are a class of materials with a lattice structure composed of corner-sharing triangles that give rise to 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, limiting the investigation of the emergent flat band physics. By combining soft X-ray angle-resolved resolved photoemission spectroscopy (ARPES) and the first-principles calculations, we reveal the electronic structure of a novel kagome metal CeNi5 with a clear dispersion along kz direction and a Fermi level flat band on the Γ-K-M-Γ plane. Besides, resonant ARPES experiments results indicate a near 4+ valence state of Ce ions, which is consistent with the transport measurements. 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 as well as the interaction between different types of flat bands by tuning the valence state of Ce ions.

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新型卡戈米金属 CeNi5 中费米级平带的实验观测

卡戈米材料是一类具有由分角三角形组成的晶格结构的材料，它能产生各种奇异的电子现象，如狄拉克费米子、范霍夫奇点和平坦带。然而，大多数已知的 kagome 材料的平带都与费米能相脱离，从而限制了对新出现的平带物理学的研究。通过结合软 X 射线角分辨光发射光谱（ARPES）和第一原理计算，我们揭示了一种新型卡戈美金属 CeNi5 的电子结构，它沿 kz 方向具有明显的色散，费米级平带位于 Γ-K-M-Γ 平面上。此外，共振 ARPES 实验结果表明铈离子的价态接近 4+，这与传输测量结果一致。我们的研究结果证明了 CeNi5 作为一种新的神目金属所具有的独特电子特性，并为通过调整 Ce 离子的价态来探索平带物理以及不同类型平带之间的相互作用提供了一个理想的平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.