SmTe $_3$超快转变中埋畴壁的形成
Formation of buried domain walls in the ultrafast transition of SmTe$_3$
摘要：
利用X射线自由电子激光研究了SmTe $_3$的电荷密度波（CDW）的超快X射线衍射。CDW峰表明，以800 nm为中心的近红外泵浦光激发产生垂直于样品表面传播的序参量的畴壁。这些畴壁破坏了CDW的长程序，并抑制了CDW的衍射强度，其时间远长于局部电子能隙的$\sim 1$ ~ps恢复。我们重建的空间和时间依赖的序参量，使用一个简单的Ginzburg-Landau模型，发现实验和模型之间的通量依赖性很好的协议。基于该模型，我们发现，在很长一段时间内，依赖于泵浦能量密度，多个畴壁保持在距离表面几纳米。
英文摘要：
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.
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