Terahertz wave emission from the trigonal layered PtBi2

Yu Gao; Yunhe Pei; Tian Xiang; Liang Cheng; Jingbo Qi

doi:10.1016/j.isci.2022.104511

Terahertz wave emission from the trigonal layered PtBi₂

iScience. 2022 Jun 2;25(7):104511. doi: 10.1016/j.isci.2022.104511. eCollection 2022 Jul 15.

Authors

Yu Gao¹, Yunhe Pei¹, Tian Xiang¹, Liang Cheng¹, Jingbo Qi¹

Affiliation

¹ State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China.

Abstract

In this work, broadband terahertz (THz) wave emissions have been detected from the trigonal layered PtBi₂ on the excitation of the femtosecond laser pulses. Such THz generation is found to arise from the dominated linear photogalvanic effect, which is further discovered to strongly depend on the unique electronic structures of PtBi₂. Furthermore, an effective nonlinear susceptibility of PtBi₂ is also obtained and is nearly two orders of magnitude larger than that of the traditional nonlinear crystal for THz generation.

Keywords: Nanomaterials; Radiation physics; Transport property of condensed matter.