By combining angle-resolved photoemission spectroscopy (ARPES), scanning tunneling microscopy (STM), piezoresponse force microscopy (PFM) and first-principles calculations, we have studied the low-energy band structure, atomic structure and charge polarization on the surface of a topological semimetal candidate TaNiTe5. Dirac-like surface states were observed on the (010) surface by ARPES, consistent with the first-principles calculations. On the other hand, PFM reveals a switchable ferroelectric-like polarization on the same surface. We propose that the noncentrosymmetric surface reconstruction observed by STM could be the origin of the observed ferroelectric-like state in this novel material. Our findings provide a new platform with the coexistence of ferroelectric-like surface charge distribution and novel surface states.
@article{arxiv.2106.09426,
title = {Coexistence of Ferroelectric-like Polarization and Dirac-like Surface State in TaNiTe5},
author = {Yunlong Li and Zhao Ran and Chaozhi Huang and Guanyong Wang and Peiyue Shen and Haili Huang and Chunqiang Xu and Yi Liu and Wenhe Jiao and Wenxiang Jiang and Jiayuan Hu and Gucheng Zhu and Chenhang Xu and Qi Lu and Guohua Wang and Qiang Jing and Shiyong Wang and Zhiwen Shi and Jinfeng Jia and Xiaofeng Xu and Wentao Zhang and Weidong Luo and Dong Qian},
journal= {arXiv preprint arXiv:2106.09426},
year = {2022}
}