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在有机电荷转移晶体中激光诱导的铁电结构秩序
Eric Collet1, Marie-Hélene Lemée-Cailleau, Marylise Buron-Le Cointe
1Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Universite Rennes 1, 35042 Rennes Cedex, France.
Science (New York, N.Y.)
|April 26, 2003
概括
研究人员使用X射线衍射观察了一种分子材料的光诱导相位过渡,从平电到铁电. 这种由激光脉冲驱动的过渡显示出强大的电子结构合和自我组织的秩序.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 晶体学 晶体学是指结晶学.
背景情况:
- 电荷转移分子材料在电子和结构性质之间表现出强烈的合.
- 光诱导的相变提供了控制材料属性的途径.
- 了解这些转变是开发新型电子设备的关键.
研究的目的:
- 直接观察四亚富烯-p-chloranil中光诱导的偏电到铁电相变.
- 阐明分子层面的结构变化的动态.
- 调查电子结构合在驱动相位转换中的作用.
主要方法:
- 使用单色100皮秒同步X射线脉冲进行时间分辨率衍射.
- 使用300 femt秒激光脉冲来启动光诱导过渡.
- 分析X射线衍射数据以精制光刺激前后的晶体结构.
主要成果:
- 直接观察一个结构相位过渡的准电到铁电.
- 在500比秒的时间尺度上,中性到离子状态切换的证据.
- 自主组织的远程结构秩序和宏观铁电重组的演示.
结论:
- 该研究证实了电荷转移分子材料中的光诱导铁电相变.
- 强大的电子结构合和合作性对于观察到的现象至关重要.
- 分子水平的结构变化是宏观铁电重组的基础.
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