Anisotropic photocurrent response at MnBi2Te4-metal interface

Xiaolan Zhang, Jingchuan Zheng, Junchao Ma, Yuxin Song, Xin Zhang, Qinghang Liu, Linghan Wang, Peiyao Xiao, Yongkai Li, Zhiwei Wang, Wende Xiao, Junxi Duan, Zhaolong Cao*, Qinsheng Wang*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

2 引用 (Scopus)

摘要

The magnetic topological insulator MnBi2Te4 has attracted a lot of research interests for its exotic properties due to the interplay between nontrivial topology and magnetism. Here, we report the photocurrent (PC) response of MnBi2Te4 flakes under the excitation wavelengths between 633 nm and 4000 nm measured by scanning PC microscopy. We observe a significant polarization dependent PC response at the interface between metal electrode and MnBi2Te4, while the PC response remains polarization-independent at MnBi2Te4 layer steps. The polarization dependent PC at the MnBi2Te4-metal electrode interface, which is attributed to the polarization dependent light absorption at the interface, preserves in the whole tested wavelength range. The responsivity of the device is 80 μA W-1. This responsivity as well as PC polarity is consistent with the results calculated based on a photo-thermoelectric generation mechanism, thus we infer that photo-thermoelectric effect dominates in the PC generation at MnBi2Te4-metal interface. Our results reveal the photoelectric response mechanism of the emerging material MnBi2Te4 for its potential optoelectronic applications.

源语言英语
文章编号045011
期刊2D Materials
10
4
DOI
出版状态已出版 - 10月 2023

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Zhang, X., Zheng, J., Ma, J., Song, Y., Zhang, X., Liu, Q., Wang, L., Xiao, P., Li, Y., Wang, Z., Xiao, W., Duan, J., Cao, Z., & Wang, Q. (2023). Anisotropic photocurrent response at MnBi2Te4-metal interface. 2D Materials, 10(4), 文章 045011. https://doi.org/10.1088/2053-1583/acef3a