论文标题
通过时域Terahertz光谱揭示了极性抗铁磁铁Fe2mo3O8的超强镁晶状体耦合
Revealing ultra-strong magnon-photon coupling in a polar antiferromagnet Fe2Mo3O8 by time domain terahertz spectroscopy
论文作者
论文摘要
镁和电磁波之间的强耦合会导致形成一个耦合的Spinphoton准粒子，称为Magnon-Polariton。近年来，对微波腔内的铁磁系统进行了很好的研究。然而，对于抗铁磁铁（AFM）而言，很少能看到木核的形成，因为强耦合条件不容易实现。在这里，我们提出了多种极性抗抗铁磁铁FE2MO3O8上的时间域Terahertz测量。我们发现，在TN以下的电动镁频率上方和下方，两种模式之间的跳动清楚，我们将其分配给AFM少镁果的形成。根据能级分解，得出了超强的自旋光子耦合效果。然而，在频域测量中不存在AFM木元核酸。我们的工作表明，由Ultrashort THZ脉冲驱动的相干镁形成提供了一种检测Polariton模式分裂的新方法。
Strong coupling between magnon and electromagnetic wave can lead to the formation of a coupled spinphoton quasiparticle named as magnon-polariton. The phenomenon is well studied for ferromagnetic systems inside microwave cavities in recent years. However, formation of magnon-polariton is rarely seen for an antiferromagnet (AFM) because the strong coupling condition is not easily fulfilled. Here we present time-domain terahertz measurement on a multiferroic polar antiferromagnet Fe2Mo3O8. We find clearly beating between two modes at frequencies above and below the electric-active magnon frequency below TN, which we assign to the formation of AFM magnon-polariton. An ultra-strong spin-photon coupling effect is derived based on the energy level splitting. However, the AFM magnon-polariton is absent in the frequency domain measurement. Our work reveals that the coherent magnon formation driven by the ultrashort THz pulse provides a new way to detect polariton mode splitting.
