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arXiv · 2306.16724

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Jianyang Ding·Ningning Zhao·Zicheng Tao·Zhe Huang·Zhicheng Jiang·Yichen Yang·Soohyun Cho·Zhengtai Liu·Jishan Liu·Yanfeng Guo·Kai Liu·Zhonghao Liu·Dawei Shen
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Abstract

RV6Sn6 (R = Y and lanthanides) with two-dimensional vanadium-kagome surface states is an ideal platform to investigate kagome physics and manipulate the kagome features to realize novel phenomena. Utilizing the micron-scale spatially resolved angle-resolved photoemission spectroscopy and first-principles calculations, we report a systematical study of the electronic structures of RV6Sn6 (R = Gd, Tb, and Lu) on the two cleaved surfaces, i.e., the V- and RSn1-terminated (001) surfaces. The calculated bands without any renormalization match well with the main ARPES dispersive features, indicating the weak electronic correlation in this system. We observe 'W'-like kagome surface states around the Brillouin zone corners showing R-element-dependent intensities, which is probably due to various coupling strengths between V and RSn1 layers. Our finding suggests an avenue for tuning electronic states by interlayer coupling based on two-dimensional kagome lattices.

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Jianyang Ding, Ningning Zhao, Zicheng Tao, Zhe Huang, Zhicheng Jiang, Yichen Yang, Soohyun Cho, Zhengtai Liu, Jishan Liu, Yanfeng Guo, Kai Liu, Zhonghao Liu, Dawei Shen. 2023-06-29. Kagome surface states and weak electronic correlation in vanadium-kagome metals. https://doi.org/10.1088/1361-648x%2Face2a2

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