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.
A 2D van der Waals Material for Terahertz Emission with Giant Optical Rectification
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abstract
Exfoliation and stacking of two-dimensional (2D) van der Waals (vdW) crystals have created unprecedented opportunities in the discovery of quantum phases. A major obstacle to the advancement of this field is the limited spectroscopic access due to a mismatch in sample sizes (1 - 10 micrometer) and wavelengths (0.1 - 1 millimeter) of electromagnetic radiation relevant to their low-energy excitations. Here, we introduce a new member of the 2D vdW material family: a terahertz (THz) emitter. We show intense and broadband THz generation from the vdW ferroelectric semiconductor NbOI2 with optical rectification efficiency over one-order-of-magnitude higher than that of the current standard THz emitter, ZnTe. The NbOI2 THz emitter can be easily integrated into vdW heterostructures for on-chip near-field THz spectroscopy of a target vdW material/device. Our approach provides a general spectroscopic tool for the rapidly expanding field of 2D vdW materials and quantum matter.
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cond-mat.mtrl-sci 1years
2025 1verdicts
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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.