Helicity-dependent THz emission induced by ultrafast spin photocurrent in nodal-line semimetal candidate Mg3Bi2 | Zendy

Mingyu Tong | Zendy; 胡瑜泽 Hu Yuze | Zendy; Xie Xiangnan | Zendy; Zhu Xiegang | Zendy; Zhenyu Wang | Zendy; Cheng Xiang-ai | Zendy; Tian Jiang | Zendy

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Helicity-dependent THz emission induced by ultrafast spin photocurrent in nodal-line semimetal candidate Mg3Bi2

Author(s) -

Mingyu Tong,

胡瑜泽 Hu Yuze,

Xie Xiangnan,

Zhu Xiegang,

Zhenyu Wang,

Cheng Xiang-ai,

Tian Jiang

Publication year - 2020

Publication title -

opto-electronic advances

Language(s) - English

Resource type - Journals

ISSN - 2096-4579

DOI - 10.29026/oea.2020.200023

Subject(s) - helicity , photocurrent , terahertz radiation , physics , ultrashort pulse , circular polarization , photon , semimetal , polarization (electrochemistry) , optoelectronics , condensed matter physics , optics , band gap , laser , quantum mechanics , chemistry , microstrip

Helicity-dependent ultrafast spin current generated by circularly polarized photons in topological materials holds the crux to many technological improvements, such as quantum communications, on-chip communication processing and storage. Here, we present the manipulation of helicity-dependent terahertz emission generated in a nodal line semimetal candidate Mg3Bi2 by using photon polarization states. The terahertz emission is mainly ascribed to the helicity-dependent photocurrent that is originated from circular photogalvanic effects, and the helicity-independent photocurrent that is attributed to linear photogalvanic effect. Our work will inspire more explorations into novel nodal line semimetals and open up new opportunities for developing ultrafast optoelectronics in the topological system.

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