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.
@article{arxiv.2306.16724,
title = {Kagome surface states and weak electronic correlation in vanadium-kagome metals},
author = {Jianyang Ding and Ningning Zhao and Zicheng Tao and Zhe Huang and Zhicheng Jiang and Yichen Yang and Soohyun Cho and Zhengtai Liu and Jishan Liu and Yanfeng Guo and Kai Liu and Zhonghao Liu and Dawei Shen},
journal= {arXiv preprint arXiv:2306.16724},
year = {2023}
}