Ultrafast x-ray diffraction of a ferroelectric soft mode driven by broadband terahertz pulses
Intense, few-cycle pulses in the terahertz frequency range have strong potential for schemes of control over vibrational modes in solid-state materials in the electronic ground-state. Here we report an experiment using single cycle terahertz pulses to directly excite lattice vibrations in the ferroe...
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| creator | Grübel, S Johnson, J A Beaud, P Dornes, C Ferrer, A Haborets, V Huber, L Huber, T Kohutych, A Kubacka, T Kubli, M Mariager, S O Rittmann, J Saari, J I Vysochanskii, Y Ingold, G Johnson, S L |
| description | Intense, few-cycle pulses in the terahertz frequency range have strong potential for schemes of control over vibrational modes in solid-state materials in the electronic ground-state. Here we report an experiment using single cycle terahertz pulses to directly excite lattice vibrations in the ferroelectric material \(\mathrm{Sn_2P_2S_6}\) and ultrafast x-ray diffraction to quantify the resulting structural dynamics. A model of a damped harmonic oscillator driven by the transient electric field of the terahertz pulses describes well the movement of the Sn\(^{2+}\) ion along the ferroelectric soft mode. Finally, we describe an anharmonic extension of this model which predicts coherent switching of domains at peak THz-frequency fields of 790 kV/cm. |
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Here we report an experiment using single cycle terahertz pulses to directly excite lattice vibrations in the ferroelectric material \(\mathrm{Sn_2P_2S_6}\) and ultrafast x-ray diffraction to quantify the resulting structural dynamics. A model of a damped harmonic oscillator driven by the transient electric field of the terahertz pulses describes well the movement of the Sn\(^{2+}\) ion along the ferroelectric soft mode. 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| subjects | Anharmonicity Broadband Domains Electric fields Electrons Ferroelectric materials Ferroelectricity Frequency ranges Harmonic oscillators Lattice vibration Terahertz frequencies X-ray diffraction |
| title | Ultrafast x-ray diffraction of a ferroelectric soft mode driven by broadband terahertz pulses |
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