The new two-dimensional (2D) kagome superconductor CsV3Sb5 has attracted much recent attention due to the coexistence of superconductivity, charge order, topology and kagome physics. A key issue in this field is to unveil the unique reconstructed electronic structure, which successfully accommodates different orders and interactions to form a fertile ground for emergent phenomena. Here, we report angle-resolved photoemission spectroscopy (ARPES) evidence for two distinct band reconstructions in CsV3Sb5. The first one is characterized by the appearance of new electron energy band at low temperature. The new band is theoretically reproduced when the three dimensionality of the charge order is considered for a band-folding along the out-of-plane direction. The second reconstruction is identified as a surface induced orbital-selective shift of the electron energy band. Our results provide the first evidence for the three dimensionality of the charge order in single-particle spectral function, highlighting the importance of long-range out-of-plane electronic correlations in this layered kagome superconductor. They also point to the feasibility of orbital-selective control of the band structure via surface modification, which would open a new avenue for manipulating exotic phenomena in this system, including superconductivity.
@article{arxiv.2106.01248,
title = {Distinct band reconstructions in kagome superconductor CsV$_3$Sb$_5$},
author = {Yang Luo and Shuting Peng and Samuel M. L. Teicher and Linwei Huai and Yong Hu and Brenden R. Ortiz and Zhiyuan Wei and Jianchang Shen and Zhipeng Ou and Bingqian Wang and Yu Miao and Mingyao Guo and M. Shi and Stephen D. Wilson and J. -F. He},
journal= {arXiv preprint arXiv:2106.01248},
year = {2023}
}