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arXiv 1909.04669cond-mat.supr-con
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超导体时间分辨电导率理论:两种计算方法的比较

Theory of time-resolved optical conductivity of superconductors:comparing two methods for its evaluation

John P. Revelle, Ankit Kumar, Alexander F. Kemper

摘要:

时间分辨的光学电导率是一种经常使用的工具,用来询问量子材料的平衡。从理论上计算这个可观察到的是一个复杂的话题,在文献中讨论了几种方法。使用非平衡Keldysh形式主义和一个功能性的衍生物的方法的电导率,我们提出了一个比较两个特定的方法来计算的光学电导率,和他们的显着特点,适用于泵浦超导体。这两种方法的区别在于探头和门时间的相对运动;探头或门时间保持固定,而另一个被扫描。我们发现,这两种方法导致相同的定性特征的时间分辨电导率泵结束后。然而,通过保持栅极固定来计算电导率消除了其他方法固有的伪影。我们提供的软件,基于第一种方法的数据,能够构建第二种方法。

英文摘要:

Time-resolved optical conductivity is an oft-used tool to interrogate quantum materials driven out of equilibrium. Theoretically calculating this observable is a complex topic with several approaches discussed in the literature. Using a non-equilibrium Keldysh formalism and a functional derivative approach to the conductivity, we present a comparison of two particular approaches to the calculation of the optical conductivity, and their distinguishing features, as applied to a pumped superconductor. The two methods are distinguished by the relative motion of the probe and gate times; either the probe or gate time is kept fixed while the other is swept. We find that both the methods result in same qualitative features of the time-resolved conductivity after pump is over. However, calculating the conductivity by keeping the gate fixed removes artifacts inherent to the other method. We provide software that, based on data for the first method, is able to construct the second approach.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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