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arXiv 1701.09129cond-mat.mtrl-sci
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最佳超快晶格控制对铁电晶体原子间相互作用势的实验研究

Experimentally Exploring the Interatomic Potential in a Ferroelectric Crystal via Optimal Ultrafast Lattice Control

Blake S. Dastrup, Jacob R. Hall, Jeremy A. Johnson

摘要:

我们提出了一个直接的比较共振太赫兹(THz)和非共振脉冲受激拉曼散射(ISRS)激发的声子极化激元在铁电锂离子。THz激发提供了选择性地仅将前向传播的声子-极化激元模式驱动到极高振幅的优点,而没有由于在拉曼激发中使用的高800 nm泵浦注量下的非线性过程而引起的复杂化。在峰-峰太赫兹电场强度超过1 MV/cm时,铁电晶格被驱动到非谐状态,从而允许实验确定势能面的形状。

英文摘要:

We present a direct comparison between resonant terahertz (THz) and nonresonant impulsive stimulated Raman scattering (ISRS) excitation of phonon-polaritons in ferroelectric lithium niobate. THz excitation offers advantages of selectively driving only the forward propagating phonon-polariton mode to exceedingly high amplitudes, without complications due to nonlinear processes at the high 800 nm pump fluences used in Raman excitation. At peak-to-peak THz electric field strengths exceeding 1 MV/cm, the ferroelectric lattice is driven into the anharmonic regime, allowing experimental determination of the shape of the potential energy surface.

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