Author(s): Cheng, L (Cheng, Long); Li, HP (Li, Huiping); Lin, GT (Lin, Gaoting); Yan, J (Yan, Jian); Zhang, L (Zhang, Lei); Yang, C (Yang, Cheng); Tong, W (Tong, Wei); Ren, Z (Ren, Zhuang); Zhu, W (Zhu, Wang); Cong, X (Cong, Xin); Gao, JJ (Gao, Jingjing); Tan, PH (Tan, Pingheng); Luo, X (Luo, Xuan); Sun, YP (Sun, Yuping); Zhu, WG (Zhu, Wenguang); Sheng, ZG (Sheng, Zhigao)

Source: ADVANCED SCIENCE Article Number: 2103229 DOI: 10.1002/advs.202103229 Early Access Date: OCT 2021

Abstract: Searching multiple types of terahertz (THz) irradiation source is crucial for the THz technology. In addition to the conventional fermionic cases, bosonic quasi-/particles also promise energy-efficient THz wave emission. Here, by utilizing a 2D ferromagnetic Cr2Ge2Te6 crystal, first a phonon-related magneto-tunable monochromatic THz irradiation source is demonstrated. With a low-photonic-energy broadband THz pump, a strong THz irradiation with frequency approximate to 0.9 THz and bandwidth approximate to 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 external 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 confirm 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.

Accession Number: WOS:000712583900001

PubMed ID: 34716689

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Cheng, Long                  0000-0001-6171-3600

eISSN: 2198-3844

Full Text: https://onlinelibrary.wiley.com/doi/10.1002/advs.202103229