非线性电子-声子耦合光泵金属动力学中的声子诱导无序
Phonon-induced disorder in dynamics of optically pumped metals from non-linear electron-phonon coupling
摘要：
光激发的物质的非平衡动力学可能会产生不存在于平衡态的电子相，例如激光诱导的高转变温度超导性。在这里，我们模拟了在初始时间$t=0$由空间均匀的泵，激发偶极激活的振动模式，耦合二次电子驱动的金属的动力学。我们详细研究了电子和振动观测量及其相干性的演化。我们提供的证据增强本地电子相关性，包括双占用，伴随着空间结构的快速损失，我们解释为一个签名的紧急有效的动态无序。这种有效的无序，它出现在淬火的随机性的情况下，占主导地位的电子动力学系统朝着相关的电子-声子长时间状态的演变，可能解释为什么没有观察到瞬态超导性。这里研究的泵浦电子-声子系统，这是由非线性耦合，表现出更实质性的动力学响应比线性耦合模型相关的平衡，从而提出了一个新的模式的途径不平衡相。我们的研究结果提供了一个基础，在其中了解相关动力学在当前的泵浦探测实验的振动耦合电子，突出的相位相干性的演变的重要性，并证明泵浦电子-声子系统提供了一种手段，大约实现最近提出的情况下，动态诱导的障碍，不变性系统。
英文摘要：
The non-equilibrium dynamics of matter excited by light may produce electronic phases that do not exist in equilibrium, such as laser-induced high-transition-temperature superconductivity. Here we simulate the dynamics of a metal driven at initial time $t=0$ by a spatially uniform pump that excites dipole-active vibrational modes which couple quadratically to electrons. We study in detail the evolution of electronic and vibrational observables and their coherences. We provide evidence for enhancement of local electronic correlations, including double occupancy, accompanied by rapid loss of spatial structure, which we interpret as a signature of emergent effective disorder in the dynamics. This effective disorder, which arises in absence of quenched randomness, dominates the electronic dynamics as the system evolves towards a correlated electron-phonon long-time state, possibly explaining why transient superconductivity is not observed. The pumped electron-phonon systems studied here, which are governed by non-linear coupling, exhibit a much more substantial dynamical response than linearly coupled models relevant in equilibrium, thus presenting a pathway to new modalities for out-of-equilibrium phases. Our results provide a basis within which to understand correlation dynamics in current pump-probe experiments of vibrationally coupled electrons, highlight the importance of the evolution of phase coherence, and demonstrate that pumped electron-phonon systems provide a means of approximately realizing recently proposed scenarios of dynamically induced disorder in translation-invariant systems.
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