论文标题
在SMTE的超快过渡中，埋入域墙的形成$ _3 $
Formation of buried domain walls in the ultrafast transition of SmTe$_3$
论文作者
论文摘要
我们使用X射线游离电子激光研究了SMTE $ _3 $的电荷密度波（CDW）上的超快X射线衍射。 CDW峰表明，以800 nm为中心的近红外泵的光激发会生成顺序参数的域壁，该域壁呈垂直于样品表面。这些域壁破坏了CDW的远距离顺序，并抑制CDW的衍射强度比$ \ sim 1 $ 〜ps恢复本地电子间隙的时间长得多。我们使用简单的Ginzburg-Landau模型重建顺序参数的空间和时间依赖性，并在实验和模型的依赖性之间找到良好的一致性。基于该模型，我们发现长时间取决于泵的通量，多个域壁仍保持在距表面几乎不到nm的距离。
We study ultrafast x-ray diffraction on the charge density wave (CDW) of SmTe$_3$ using an x-ray free electron laser. The CDW peaks show that photoexcitation with near-infrared pump centered at 800 nm generates domain walls of the order parameter propagating perpendicular to the sample surface. These domain walls break the CDW long range order and suppress the diffraction intensity of the CDW for times much longer than the $\sim 1$~ps recovery of the local electronic gap. We reconstruct the spatial and temporal dependence of the order parameter using a simple Ginzburg-Landau model and find good agreement between the experimental and model fluence dependences. Based on the model we find that at long times, depending on the pump fluence, multiple domain walls remain at distances of few nm from the surface.
