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- W4327720991 abstract "We present a joint experimental and computational study of second harmonic generation and Kerr effect induced by intense terahertz electric fields in the quantum paraelectric material ${mathrm{KTaO}}_{3}$. The single-cycle terahertz (THz) electric pulses induce the free induction decay of the polar soft phonon mode and a ferroelectric polarization response that lasts for several picoseconds in both experiment and computation. We observe a much longer-lasting (43-ps) transient Kerr effect that follows the THz excitation. We explain the disparity in the relaxation times between the THz-induced second harmonic generation and the Kerr effect by the presence of the polar nanoregions intrinsic to ${mathrm{KTaO}}_{3}$. The origin of the slow THz Kerr effect dynamics is not presently understood. We speculate that it may be associated with the rotational motion of polar nanoregions due to the material's proximity to the ferroelectric phase transition." @default.
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- W4327720991 date "2023-02-21" @default.
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- W4327720991 title "Terahertz pulse induced second harmonic generation and Kerr effect in the quantum paraelectric <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>KTaO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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- W4327720991 doi "https://doi.org/10.1103/physrevb.107.064306" @default.
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