论文标题
亚稳态隐藏阶段的连贯的光控制
Coherent Light Control of a Metastable Hidden Phase
论文作者
论文摘要
亚稳态是扩大复杂材料功能的有希望的途径。特别令人感兴趣的是在平衡条件下无法访问的光诱导的亚稳态相，因为它们经常在超快时间尺度上具有新的新兴特性。但是，管理轨迹到这种隐藏阶段的过程在很大程度上尚未得到探索。在这里，使用时间和角度分辨光发射光谱法，我们研究了在光激发时在分层的二进制二进制二进制二进制基因剂1T-TAS $ _2 $中形成隐藏量子状态的超快动力学。我们的结果揭示了由集体电荷密度激发控制的过渡的非热特征。利用结构模式的双脉冲激发，我们显示了相变效率的振动相干控制。我们证明了隐藏阶段的特殊控制，开关速度和稳定性是设备应用程序的关键。
Metastable phases present a promising route to expand the functionality of complex materials. Of particular interest are light-induced metastable phases that are inaccessible under equilibrium conditions, as they often host new, emergent properties switchable on ultrafast timescales. However, the processes governing the trajectories to such hidden phases remain largely unexplored. Here, using time- and angle-resolved photoemission spectroscopy, we investigate the ultrafast dynamics of the formation of a hidden quantum state in the layered dichalcogenide 1T-TaS$_2$ upon photoexcitation. Our results reveal the nonthermal character of the transition governed by a collective charge-density-wave excitation. Utilizing a double-pulse excitation of the structural mode, we show vibrational coherent control of the phase-transition efficiency. Our demonstration of exceptional control, switching speed, and stability of the hidden phase are key for device applications.
