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Terahertz Magnon-Polaritons in TmFeO3

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  • Kirill Grishunin
  • Thomas J. Huisman
  • Guanqiao Li
  • Elena Mishina
  • Theo Rasing
  • Alexey V. Kimel
  • Kailing Zhang
  • Zuanming Jin
  • Shixun Cao
  • Wei Ren
  • Guo-Hong Ma
  • Rostislav Mikhaylovskiy
<mark>Journal publication date</mark>18/04/2018
<mark>Journal</mark>ACS Photonics
Issue number4
Number of pages6
Pages (from-to)1375-1380
Publication StatusPublished
Early online date1/02/18
<mark>Original language</mark>English


Magnon-polaritons are shown to play a dominant role in the propagation of terahertz (THz) waves through TmFeO3 orthoferrite, if the frequencies of the waves are in the vicinity of the quasi-antiferromagnetic spin resonance mode. Both time-domain THz transmission and emission spectroscopies reveal clear beatings between two modes with frequencies slightly above and slightly below this resonance, respectively. Rigorous modeling of the interaction between the spins of TmFeO3 and the THz light shows that the frequencies correspond to the upper and lower magnon-polariton branches. Our findings reveal the previously ignored importance of propagation effects and polaritons in such heavily debated areas as THz magnonics and THz spectroscopy of electromagnons. It also shows that future progress in these areas calls for an interdisciplinary approach at the interface between magnetism and photonics.