论文标题
在3D轨道驱动的Peierls绝缘子Cuir $ _ {2} $ s $ _ {4} $
First-order kinetics bottleneck during photoinduced ultrafast insulator-metal transition in 3D orbitally-driven Peierls insulator CuIr$_{2}$S$_{4}$
论文作者
论文摘要
通过全能超级超级脉冲多螺栓分辨率分辨光谱镜检查，研究了cuir $ _ {2} $ s $ _ {4} $的光诱导的三维PEIERLS样绝缘基 - 金属（IM）过渡的超快动力学。低 - $ t $破碎的对称状态的结构相干性在超过阈值激发能力$ f _ {\ mathrm {c}} \ 3 $ mj/cm $^{2} $（以1.55-ev photon Energy的状态下，在结构上，在结构上均在结构上，perserist of structient of structiant inshome inshome， picseconds在恢复到原始的低$ t $状态之前。电子订单显示出瞬态差距填充，在$ \ sim0.6 $ 〜mj/cm $^{2} $的较低较低的通量阈值中。数据表明，对高$ t $金属相的光诱导 - 转变结构动力学受一阶过渡成核动力学的控制，这些动力学可以防止甚至在激发流量下，即使在激发流量下，完全结构过渡到高$ t $相位也明显大于$ f _ {\ mathrm {c}} $。相比之下，由于光诱导的莫特过渡，动态耦合的电子顺序被抑制了。
Ultrafast dynamics across the photoinduced three-dimensional Peierls-like insulator-metal (IM) transition in CuIr$_{2}$S$_{4}$ was investigated by means of the all-optical ultrafast multi-pulse time-resolved spectroscopy. The structural coherence of the low-$T$ broken symmetry state is strongly suppressed on a sub-picosecond timescale above a threshold excitation fluence of $F_{\mathrm{c}}\approx3$ mJ/cm$^{2}$ (at 1.55-eV photon energy) resulting in a structurally inhomogeneous transient state which persists for several-tens of picoseconds before reverting to the original low-$T$ state. The electronic order shows a transient gap filling at a significantly lower fluence threshold of $\sim0.6$~mJ/cm$^{2}$. The data suggest that the photoinduced-transition structural dynamics to the high-$T$ metallic phase is governed by first-order-transition nucleation kinetics that prevents the complete structural transition into the high-$T$ phase even at excitation fluences significantly larger than $F_{\mathrm{c}}$. In contrast, the dynamically-decoupled electronic order is suppressed rather independently due to a photoinduced Mott transition.
