Sous John, Kloss Benedikt, Kennes Dante M, Reichman David R, Millis Andrew J
Department of Physics, Columbia University, New York, NY, 10027, USA.
Department of Chemistry, Columbia University, New York, NY, 10027, USA.
Nat Commun. 2021 Oct 4;12(1):5803. doi: 10.1038/s41467-021-26030-3.
The non-equilibrium dynamics of matter excited by light may produce electronic phases, such as laser-induced high-transition-temperature superconductivity, that do not exist in equilibrium. Here we simulate the dynamics of a metal driven at initial time by a spatially uniform pump that excites dipole-active vibrational modes which couple nonlinearly to electrons. We provide evidence for rapid loss of spatial coherence, leading to emergent effective disorder in the dynamics, which arises in a system unitarily evolving under a translation-invariant Hamiltonian, and dominates the electronic behavior as the system evolves towards a correlated electron-phonon long-time state, possibly explaining why transient superconductivity is not observed. Our framework provides 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 realizing dynamically induced disorder in translation-invariant systems.
由光激发的物质的非平衡动力学可能会产生平衡态中不存在的电子相，例如激光诱导的高温超导。在此，我们模拟了一种金属在初始时刻由空间均匀泵浦驱动的动力学过程，该泵浦激发了与电子非线性耦合的偶极活性振动模式。我们提供了空间相干性快速丧失的证据，这导致动力学中出现有效的无序，这种无序出现在一个在平移不变哈密顿量下幺正演化的系统中，并且在系统向电子 - 声子关联的长时间状态演化时主导电子行为，这可能解释了为何未观察到瞬态超导现象。我们的框架为理解当前振动耦合电子的泵浦 - 探测实验中的关联动力学提供了一个基础，突出了相位相干演化的重要性，并证明了泵浦的电子 - 声子系统提供了一种在平移不变系统中实现动态诱导无序的方法。
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