The newly discovered ternary chalcogenide superconductor Bi2Rh3Se2 has attracted growing attention, which provides an opportunity to explore the interplay between charge density wave (CDW) order and superconductivity. However, whether the phase transition at 240 K can be attributed to CDW formation remains controversial. To help resolve the debate, we study the electronic structure study of Bi2Rh3Se2 by angle-resolved photoemission spectroscopy experiments, with emphasis on the nature of its high-temperature phase transition at 240 K. Our measurements demonstrate that the phase transition at 240 K is a second-order CDW phase transition. Our results reveal (i) a 2 x 2 CDW order in Bi2Rh3Se2, accompanied by the reconstruction of electronic structure, such as band folding, band splitting, and opening of CDW gaps at and away from Fermi level; (ii) the existence of electron-phonon coupling, which is manifested as an obvious kink and peak-dip-hump structure in dispersion; and (iii) the appearance of a flat band. Our observations thus enable us to shed light on the nature of the CDW order and its interplay with superconductivity in Bi2Rh3Se2.
@article{arxiv.2203.03793,
title = {Charge Density Wave order and electron-phonon coupling in ternary superconductor Bi$_2$Rh$_3$Se$_2$},
author = {Zi-Teng Liu and Chen Zhang and Qi-Yi Wu and Hao Liu and Bo Chen and Zhi-Bo Yin and Sheng-Tao Cui and Zhe Sun and Shuang-Xing Zhu and Jiao-Jiao Song and Yin-Zou Zhao and Hong-Yi Zhang and Xue-Qing Ye and Fan-YingWu and Shu-Yu Liu and Xiao-Fang Tang and Ya-Hua Yuan and Yun-Peng Wang and Jun He and Hai-Yun Liu and Yu-Xia Duan and Jian-Qiao Meng},
journal= {arXiv preprint arXiv:2203.03793},
year = {2023}
}