论文标题
两波段脏超导体中的时间分辨光学电导率和希格斯的振荡
Time-resolved optical conductivity and Higgs oscillations in two-band dirty superconductors
论文作者
论文摘要
最近的研究强调了杂质散射对超导体光学HIGGS响应的重要性。在肮脏的极限中，光向与超导冷凝物的额外顺磁耦合产生，从而极大地增强了激发。到目前为止，大多数工作都集中在光线周期性驾驶上，在该驾驶中，希格斯模式的第三次谐波响应被证明增强了。在这项工作中，我们还计算了两脉冲猝灭探针设置中单波段和两波段超导体的时间分辨光电导率，在此我们发现与现有的实验结果非常一致。我们使用Mattis-Bardeen方法来结合杂质散射并明确计算系统的时间进化。计算都是在有效的动作形式主义和时间依赖性密度矩阵形式主义中得出的图表图片中进行的。
Recent studies have emphasized the importance of impurity scattering for the optical Higgs response of superconductors. In the dirty limit, an additional paramagnetic coupling of light to the superconducting condensate arises which drastically enhances excitation. So far, most work concentrated on the periodic driving with light, where the third-harmonic generation response of the Higgs mode was shown to be enhanced. In this work, we additionally calculate the time-resolved optical conductivity of single- and two-band superconductors in a two-pulse quench-probe setup, where we find good agreement with existing experimental results. We use the Mattis-Bardeen approach to incorporate impurity scattering and calculate explicitly the time-evolution of the system. Calculations are performed both in a diagrammatic picture derived from an effective action formalism and within a time-dependent density matrix formalism.
