论文标题
金属中电子偶联的超快动力学
Ultrafast dynamics of electron-phonon coupling in a metal
论文作者
论文摘要
在过去的十年中，时间分辨的光谱工具的出现为探索固体中的基本相互作用和脱离自由度的基本相互作用提供了新的基础，这些自由度的耦合导致频域中的广泛结构。时间和角度分辨光发射光谱（TR-arpes）已被用来直接研究金属在存在电子偶联的情况下的弛豫动力学。讨论了光探测对自我能源的真实和虚构部分以及与不同重组过程相关的时间尺度的影响。与理论模型相反，声子能量没有设定统治准颗粒动力学的清晰尺度，这也与超导材料中观察到的结果不同。这些结果表明，需要一个更完整的理论框架来了解光兴奋的状态中的电子 - 波相互作用。
In the past decade, the advent of time-resolved spectroscopic tools has provided a new ground to explore fundamental interactions in solids and to disentangle degrees of freedom whose coupling leads to broad structures in the frequency domain. Time- and angle-resolved photoemission spectroscopy (tr-ARPES) has been utilized to directly study the relaxation dynamics of a metal in the presence of electron-phonon coupling. The effect of photo-excitations on the real and imaginary part of the self-energy as well as the time scale associated with different recombination processes are discussed. In contrast to a theoretical model, the phonon energy does not set a clear scale governing quasiparticle dynamics, which is also different from the results observed in a superconducting material. These results point to the need for a more complete theoretical framework to understand electron-phonon interaction in a photo-excited state.
