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arXiv 2004.05823cond-mat.str-elcond-mat.mes-hall
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极性反铁磁体Fe2Mo3O8中超强磁振子-光子耦合的时域太赫兹光谱研究

Revealing ultra-strong magnon-photon coupling in a polar antiferromagnet Fe2Mo3O8 by time domain terahertz spectroscopy

L. Y. Shi, D. Wu, Z. X. Wang, T. Lin, C. M. Hu, N. L. Wang

摘要:

磁振子与电磁波之间的强耦合可以导致耦合自旋光子准粒子的形成,称为磁振子极化激元。近年来,微波谐振腔内铁磁系统的这一现象得到了广泛的研究。然而,形成磁振子极化激元很少看到的反铁磁体(AFM),因为强耦合条件是不容易满足的。在这里,我们提出了时域太赫兹测量的多铁性极性反铁磁体Fe 2 Mo 3 O 8。我们清楚地发现两个模式之间的频率高于和低于电活性磁振子频率低于TN,我们分配到AFM磁振子极化激元的形成。基于能级分裂,导出了一种超强自旋光子耦合效应。然而,AFM磁振子极化激元是缺席的频域测量。我们的工作揭示了超短太赫兹脉冲驱动的相干磁振子形成为探测极化激元模分裂提供了一种新的途径。

英文摘要:

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.

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