论文标题
在结构相转换中的超快纳米成像
Ultrafast nano-imaging of the order parameter in a structural phase transition
论文作者
论文摘要
了解可以通过光线切换的材料和设备中的显微镜过程需要实验性地访问纳米长度和飞秒时间尺度上的动力学。在这里，我们介绍了超快的深色野外电子显微镜，该显微镜量身定制，旨在绘制跨结构相变的顺序参数。我们跟踪超短激发激发，阐明松弛途径和域壁动力学后1T-TAS2中电荷密度波的演变。选择性对比度增强的独特好处将激发超快传输电子显微镜中未来的光束塑形技术。
Understanding microscopic processes in materials and devices that can be switched by light requires experimental access to dynamics on nanometer length and femtosecond time scales. Here, we introduce ultrafast dark-field electron microscopy, tailored to map the order parameter across a structural phase transition. We track the evolution of charge-density wave domains in 1T-TaS2 after ultrashort laser excitation, elucidating relaxation pathways and domain wall dynamics. The unique benefits of selective contrast enhancement will inspire future beam shaping technology in ultrafast transmission electron microscopy.
