Ultrafast photocurrents in the topological insulator Sb2Te3 probed by THz emission spectroscopy

Xian Lin; Shunyi Ruan; Haiyang Chen; Bangju Song; Ye Dai; Xiaona Yan; Zuanming Jin; Guohong Ma; Jianquan Yao

doi:10.1117/12.2603819

9 September 2021 Ultrafast photocurrents in the topological insulator Sb₂Te₃ probed by THz emission spectroscopy

Xian Lin, Shunyi Ruan, Haiyang Chen, Bangju Song, Ye Dai, Xiaona Yan, Zuanming Jin, Guohong Ma, Jianquan Yao

Proceedings Volume 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021); 1190902 (2021) https://doi.org/10.1117/12.2603819
Event: Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 2021, Chengdu, China

Abstract

The ultrafast photocurrents in a typical 3D topological insulator (TI) Sb₂Te₃ were probed with THz emission spectroscopy by tuning the polarization of excitation pulses and the sample’s azimuthal angle. The different ultrafast photocurrents driven by the linear photogalvanic effect, circular photogalvanic effect, and thermoelectric effect were distinguished from THz emission signal. Results potentially provide insights into the ultrafast all optical modulation of THz emission with non-external bias field, which could play a vital role in future TI-based high-speed THz optoelectronic and optospintronic devices.

Citation Download Citation

Xian Lin, Shunyi Ruan, Haiyang Chen, Bangju Song, Ye Dai, Xiaona Yan, Zuanming Jin, Guohong Ma, and Jianquan Yao "Ultrafast photocurrents in the topological insulator Sb₂Te₃ probed by THz emission spectroscopy", Proc. SPIE 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 1190902 (9 September 2021); https://doi.org/10.1117/12.2603819

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