Imaging precursory cluster fluctuations in ferroelectrics with pump-probe speckle spectroscopy

Ji K.

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Imaging precursory cluster fluctuations in ferroelectrics with pump-probe speckle spectroscopy

机译：用泵浦探针散斑光谱法成像铁电体中的前体簇波动

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We report an investigation on the dynamic property of a photo-created ferroelectric cluster observed in the paraelectric BaTiO3 as a real time correlation of speckle pattern between two soft X-ray laser pulses, at just above the paraelectric-ferroelectric phase transition temperature. Based on a model with coupled soft X-ray photon and ferroelectric phonon mode, we study the time dependence of scattering probability using a perturbative expansion approach. The cluster-associated phonon softening as well as central peak effects are reproduced well in the phonon spectral function via quantum Monte Carlo simulation. Also, it is found that the time dependence of speckle correlation is determined by the relaxation dynamics of ferroelectric clusters. Near the transition point the cluster excitation is stable, leading to a long relaxation time. While, at high temperature, the cluster structure is subject to thermal fluctuation, ending up with a short relaxation time.

机译：我们报告了对在顺电BaTiO3中观察到的光生铁电团簇的动态特性的研究，这是两个软X射线激光脉冲之间的散斑图的实时相关性，刚好在顺电-铁电相变温度之上。基于具有耦合软X射线光子和铁电声子模式的模型，我们使用摄动展开方法研究了散射概率的时间依赖性。通过量子蒙特卡洛模拟在声子谱函数中很好地再现了与簇相关的声子软化以及中心峰效应。而且，发现散斑相关性的时间依赖性由铁电团簇的弛豫动力学确定。在转变点附近，团簇激发是稳定的，导致较长的弛豫时间。而在高温下，团簇结构易受热波动的影响，最终导致弛豫时间短。

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《Phase Transitions》 |2011年第10期|共10页
作者
Ji K.;
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正文语种 eng
中图分类物理学;
关键词
critical dynamics; ferroelectric cluster; Monte Carlo simulation; optical response; structural phase transition; time-resolved spectroscopy;

机译：临界动力学铁电团簇蒙特卡罗模拟光学响应结构相变时间分辨光谱;

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1. Imaging precursory cluster fluctuations in ferroelectrics with pump-probe speckle spectroscopy [J] . Ji K. Phase Transitions . 2011,第9a10期

机译：用泵浦探针散斑光谱法成像铁电体中的前体簇波动
2. Anharmonic phonon-polariton dynamics in ferroelectric LiNbO_3 studied with single-shot pump-probe imaging spectroscopy [J] . Kuribayashi T., Motoyama T., Arashida Y., Journal of Applied Physics . 2018,第17期

机译：单次泵浦探针成像光谱研究铁电LiNbO_3中的非谐声子-极化子动力学
3. Probing isomer interconversion in anionic water clusters using an Ar-mediated pump-probe approach: Combining vibrational predissociation and velocity-map photoelectron imaging spectroscopies [J] . McCunn LR, Gardenier GH, Guasco TL, The Journal of Chemical Physics . 2008,第23期

机译：使用Ar介导的泵浦探针方法探测阴离子水簇中的异构体互变：结合振动预离解和速度图光电子成像光谱
4. Investigation of anion solvation structures in I · (water)_n clusters by femtosecond pump-probe photoelectron spectroscopy [C] . R. Weinkauf, L. Lehr, M. T. Zanni, International conference on lasers . 1999

机译：飞秒泵浦探针光电子能谱研究I·（水）_n簇中阴离子的溶剂化结构
5. Optical properties and electronic relaxation dynamics of monolayer-protected metal clusters studied using ultrafast pump-probe and magneto-optical spectroscopies [D] . Green, Thomas D. 2016

机译：使用超薄泵探针和磁光光谱研究单层保护金属簇的光学性质和电子弛豫动态
6. Superresolution imaging with optical fluctuation using speckle patterns illumination [O] . MinKwan Kim, ChungHyun Park, Christophe Rodriguez, -1

机译：使用斑点图案照明的具有光学波动的超分辨率成像
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Imaging precursory cluster fluctuations in ferroelectrics with pump-probe speckle spectroscopy

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