Evidence for Bootstrap Percolation Dynamics in a Photoinduced Phase Transition
Evidence for Bootstrap Percolation Dynamics in a Photoinduced Phase Transition
复制标题
光致相变中自举渗流动力学的证据
DOI：
10.1103/physrevlett.130.186902
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发表时间：
2023
影响因子：
8.6
通讯作者：
Kogar, Anshul
中科院分区：
文献类型：
--
作者：
Carbin, Tyler;Zhang, Xinshu;Culver, Adrian B.;Zhao, Hengdi;Zong, Alfred;Acharya, Rishi;Abbamonte, Cecilia J.;Roy, Rahul;Cao, Gang;Kogar, Anshul
在强烈的飞秒光激发下，多体系统可以通过非平衡路径经历相变，但了解这些路径仍然是一个突出的挑战。在这里，我们使用时间分辨的二次谐波产生来研究光致相变，结果表明介观不均匀性对相变动力学有深刻的影响。我们观察到量化两种结构之间跃迁的特征时间显著减慢。作为光激发通量的函数非单调地演化，从低于200fs上升到，然后又下降到低于200fs。为了解释观察到的行为，我们进行了一个自举渗流模拟，演示了局部结构相互作用如何支配转变动力学。我们的工作强调了渗流中尺度不均匀性在光致相变动力学中的重要性，并提供了一个可能有助于更广泛地理解这种相变的模型。
Upon intense femtosecond photoexcitation, a many-body system can undergo a phase transition through a nonequilibrium route, but understanding these pathways remains an outstanding challenge. Here, we use time-resolved second harmonic generation to investigate a photoinduced phase transition inand show that mesoscale inhomogeneity profoundly influences the transition dynamics. We observe a marked slowing down of the characteristic timethat quantifies the transition between two structures.evolves nonmonotonically as a function of photoexcitation fluence, rising from below 200 fs to, then falling again to below 200 fs. To account for the observed behavior, we perform a bootstrap percolation simulation that demonstrates how local structural interactions govern the transition kinetics. Our work highlights the importance of percolating mesoscale inhomogeneity in the dynamics of photoinduced phase transitions and provides a model that may be useful for understanding such transitions more broadly.