Ferroelectric Soft Mode in a SrTiO3 Thin Film Impulsively Driven to the Anharmonic Regime Using Intense Picosecond Terahertz Pulses
Ferroelectric Soft Mode in a SrTiO3 Thin Film Impulsively Driven to the Anharmonic Regime Using Intense Picosecond Terahertz Pulses
复制标题
DOI：
10.1103/physrevlett.108.097401
复制
发表时间：
2012-02-28
影响因子：
8.6
通讯作者：
Tanaka, K.
中科院分区：
文献类型：
--
作者：
Katayama, I.;Aoki, H.;Tanaka, K.
利用皮秒太赫兹脉冲将钛酸锶薄膜中的铁电软模脉冲驱动到大振幅。随着太赫兹电场的增加，软模吸收峰出现蓝移和光谱变窄。一个经典的非谐振子模型表明，诱导位移是可比的铁电相变。光谱变窄表明位移超过了由膜中的任何不均匀性引起的位移，表明该方法可以用于探索固有的四次非谐性。
The ferroelectric soft mode in a SrTiO3 thin film was impulsively driven to a large amplitude using intense picosecond terahertz pulses. As the terahertz electric field increased, the soft-mode absorption peak exhibited blueshifting and spectral narrowing. A classical anharmonic oscillator model suggests that the induced displacement is comparable to that of the ferroelectric phase transition. The spectral narrowing indicates that the displacement exceeds that induced by any inhomogeneities in the film, demonstrating that the method can be used to explore intrinsic quartic anharmonicity.