Ultrafast x-ray diffraction of a ferroelectric soft mode driven by broadband terahertz pulses
Ultrafast x-ray diffraction of a ferroelectric soft mode driven by broadband terahertz pulses
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2016-02
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通讯作者：
S. Grübel;Jeremy A. Johnson;P. Beaud;C. Dornes;A. Ferrer;V. Haborets;L. Huber;T. Huber;A. Kohutych;T. Kubacka;M. Kubli;S. Mariager;J. Rittmann;Jonathan I. Saari;Y. Vysochanskii;G. Ingold;S. Johnson
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作者：
S. Grübel;Jeremy A. Johnson;P. Beaud;C. Dornes;A. Ferrer;V. Haborets;L. Huber;T. Huber;A. Kohutych;T. Kubacka;M. Kubli;S. Mariager;J. Rittmann;Jonathan I. Saari;Y. Vysochanskii;G. Ingold;S. Johnson
在太赫兹频率范围内的强烈的，几个周期的脉冲具有很强的潜力，在电子基态的固态材料的振动模式的控制方案。在这里，我们报告了一个实验，使用单周期太赫兹脉冲直接激发晶格振动的铁电材料$\mathrm{Sn_2P_2S_6}$和超快X射线衍射来量化所产生的结构动力学。由太赫兹脉冲的瞬态电场驱动的阻尼谐振子模型很好地描述了Sn$^{2+}$离子沿着铁电软模的运动。最后，我们描述了这个模型的非谐扩展，它预测在峰值太赫兹频率场为790 kV/cm的域的相干开关。
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.