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arXiv · 2106.09426

Coexistence of Ferroelectric-like Polarization and Dirac-like Surface State in TaNiTe5

Yunlong Li·Zhao Ran·Chaozhi Huang·Guanyong Wang·Peiyue Shen·Haili Huang·Chunqiang Xu·Yi Liu·Wenhe Jiao·Wenxiang Jiang·Jiayuan Hu·Gucheng Zhu·Chenhang Xu·Qi Lu·Guohua Wang·Qiang Jing·Shiyong Wang·Zhiwen Shi·Jinfeng Jia·Xiaofeng Xu·Wentao Zhang·Weidong Luo·Dong Qian
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Abstract

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.

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Yunlong Li, Zhao Ran, Chaozhi Huang, Guanyong Wang, Peiyue Shen, Haili Huang, Chunqiang Xu, Yi Liu, Wenhe Jiao, Wenxiang Jiang, Jiayuan Hu, Gucheng Zhu, Chenhang Xu, Qi Lu, Guohua Wang, Qiang Jing, Shiyong Wang, Zhiwen Shi, Jinfeng Jia, Xiaofeng Xu, Wentao Zhang, Weidong Luo, Dong Qian. 2021-06-17. Coexistence of Ferroelectric-like Polarization and Dirac-like Surface State in TaNiTe5. https://doi.org/10.1103/physrevlett.128.106802

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