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Self-similar dynamics of order parameter fluctuations in pump-probe experiments

机译：泵探针实验中的顺序参数波动的自我相似动态

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摘要

Upon excitation by a laser pulse, broken-symmetry phases of a wide variety of solids demonstrate similar order parameter dynamics characterized by a dramatic slowing down of relaxation for stronger pump fluences. Motivated by this recurrent phenomenology, we develop a simple nonperturbative effective model for photoin-duced dynamics of collective bosonic excitations. We find that as the system recovers after photoexcitation, it shows universal prethermalized dynamics manifesting a power-law, as opposed to exponential, relaxation, explaining the slowing down of the recovery process. For strong quenches, long-wavelength overpopulated transverse modes dominate the long-time dynamics; their distribution function exhibits universal scaling in time and space, whose universal exponents can be computed analytically. Our model offers a unifying description of order parameter fluctuations in a regime far from equilibrium, and our predictions can be tested with available time-resolved techniques.
机译：在激光脉冲激发时，各种固体的破裂对称阶段展示了类似的订单参数动态，其特征在于，对于更强的泵流程，弛豫的剧烈减速。通过这种复发性现象学激励，我们开发了一种简单的非稳健有效模型，用于集体振动激发的相磷型动力学。我们发现，随着系统在运动后恢复，它显示了普遍的前置动态，表现为幂律，而不是指数放松，解释了恢复过程的减慢。对于强淬火，长波长过高的横向模式主导了长时间动态;它们的分发功能在时间和空间中表现出普遍的缩放，其普遍指数可以分析地计算。我们的模型提供了远离均衡的规范的订单参数波动的统一描述，并且我们的预测可以用可用的时间分辨技术进行测试。

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  • 来源
    《Physical review》 |2020年第17期|174306.1-174306.8|共8页
  • 作者

    Pavel E. Dolgirev; Marios H. Michael; Alfred Zong; Nuh Gedik; Eugene Demler;

  • 作者单位

    Department of Physics Harvard University Cambridge Massachusetts 02138 USA;

    Department of Physics Harvard University Cambridge Massachusetts 02138 USA;

    Massachusetts Institute of Technology Department of Physics Cambridge Massachusetts 02139 USA;

    Massachusetts Institute of Technology Department of Physics Cambridge Massachusetts 02139 USA;

    Department of Physics Harvard University Cambridge Massachusetts 02138 USA;

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