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

doi:10.1088/1361-648X/ace2a2

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

J Phys Condens Matter. 2023 Jul 7;35(40). doi: 10.1088/1361-648X/ace2a2.

Authors

Jianyang Ding^{1

2}, Ningning Zhao³, Zicheng Tao⁴, Zhe Huang^{1

4}, Zhicheng Jiang^{1

2}, Yichen Yang^{1

2}, Soohyun Cho¹, Zhengtai Liu^{1

2}, Jishan Liu^{1

2}, Yanfeng Guo⁴, Kai Liu³, Zhonghao Liu^{1

2}, Dawei Shen^{1

2}

Affiliations

¹ National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
³ Department of Physics and Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-Nano Devices, Renmin University of China, Beijing 100872, People's Republic of China.
⁴ School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, People's Republic of China.

PMID: 37379852
DOI: 10.1088/1361-648X/ace2a2

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 ofRV6Sn6(R= Gd, Tb, and Lu) on the two cleaved surfaces, i.e. the V- andRSn₁-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 showingR-element-dependent intensities, which is probably due to various coupling strengths between V andRSn₁layers. Our finding suggests an avenue for tuning electronic states by interlayer coupling based on two-dimensional kagome lattices.

Keywords: ARPES; RV6Sn6; electronic structure; first-principles calculations; kagome surface state.