Coherent polarization waves, called ferrons, are observed in the van der Waals ferroelectric NbOI2, where they emit narrow-band terahertz radiation at 3.13 THz and travel uniaxially along the polar axis at up to about 120 km/s.
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Observation of Coherent Ferrons
Coherent polarization waves, called ferrons, are observed in the van der Waals ferroelectric NbOI2, where they emit narrow-band terahertz radiation at 3.13 THz and travel uniaxially along the polar axis at up to about 120 km/s.