光激发系统中非绝热到绝热动力学量子相变模型
Model of Nonadiabatic to Adiabatic Dynamical Quantum Phase Transition in Photoexcited Systems
摘要：
我们研究了光激发系统中的超快动力学过程，发现随着态耦合从非绝热极限到绝热极限的增加，光激发态和基态之间的Franck-Condon或Landau-Zener隧穿被突然阻断。隧穿的阻断抑制了光激发态衰减到热化态，并导致亚稳态的出现，该亚稳态表示具有不同电子-声子耦合强度的电子态的纠缠。应用此模型的光激发半掺杂锰氧化物的调查，我们表明，量子临界跃迁是负责在光照射后的基态恢复时间超过三个数量级的差异。该模型还解释了一些难以解释的实验结果，如光诱导的轨道顺序重排的结构，而不是电子过程和结构瓶颈的四分之一周期的Jahn-Teller模式。我们证明，在自旋玻色子模型中存在未探索的区域，在传统的相图中没有覆盖。
英文摘要：
We study the ultrafast dynamic process in photoexcited systems and find that the Franck-Condon or Landau-Zener tunneling between the photoexcited state and the ground state is abruptly blocked with increasing the state coupling from nonadiabatic to adiabatic limits. The blockage of the tunneling inhibits the photoexcited state from decaying into the thermalized state and results in an emergence of a metastable state, which represents an entanglement of electronic states with different electron-phonon coupling strengths. Applying this model to the investigation of photoexcited half-doped manganites, we show that the quantum critical transition is responsible for more than three orders of magnitude difference in the ground state recovery times following photoirradiation. This model also explains some elusive experimental results such as photoinduced rearrangement of orbital order by structural rather than electronic process and the structural bottleneck of one-quarter period of the Jahn-Teller mode. We demonstrate that in the spin-boson model there exist unexplored regions not covered in the conventional phase diagram.
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