Phonon-related monochromatic THz radiation and its magneto-modulation in 2D ferromagnetic Cr2Ge2Te6
Abstract
Searching multiple types of terahertz (THz) irradiation source is crucial for the THz technology. Here, by utilizing a two-dimensional (2D) ferromagnetic Cr2Ge2Te6 crystal, we firstly demonstrate a magneto-tunable monochromatic THz irradiation source. With a low-photonic-energy broadband THz pump, a strong THz irradiation with frequency ~0.9 THz and bandwidth ~0.25 THz can be generated and its conversion efficiency could even reach 2.1% at 160 K. Moreover, it is intriguing to find that such monochromatic THz irradiation can be efficiently modulated by the magnetic field below 160 K. According to both experimental and theoretical analyses, the emergent THz irradiation is identified as the emission from the phonon-polariton and its temperature and magnetic field dependent behaviors confirmed the large spin-lattice coupling in this 2D ferromagnetic crystal. These observations provide a new route for the creation of tunable monochromatic THz source which may have great practical interests in future applications in photonic and spintronic devices.
Keywords
Cite
@article{arxiv.2104.03132,
title = {Phonon-related monochromatic THz radiation and its magneto-modulation in 2D ferromagnetic Cr2Ge2Te6},
author = {Long Cheng and Huiping Li and Gaoting Lin and Jian Yan and Lei Zhang and Cheng Yang and Wei Tong and Zhuang Ren and Wang Zhu and Xin Cong and Jingjing Gao and Pingheng Tan and Xuan Luo and Yuping sun and Wenguang Zhu and Zhigao Sheng},
journal= {arXiv preprint arXiv:2104.03132},
year = {2021}
}
Comments
35 pages,11 figures