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arXiv 1804.09280cond-mat.str-el
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无序系统中超导涨落的猝灭动力学和电导率

Quench dynamics of superconducting fluctuations and optical conductivity in a disordered system

Yonah Lemonik, Aditi Mitra

摘要:

在固态薄膜中产生非常短寿命的超导态已经引起了极大的兴趣。在这里,我们考虑在这样的系统中的非平衡超导波动的作用,所产生的相互作用淬火,考虑到大的静态无序的限制。特别是,我们认为,由于临界慢化,制度的波动占主导地位的\emph{normal state}是更重要的可能是天真地认为。我们展示了这种状态如何出现在光学电导率中,并给出了Azlamazov-Larkin和Maki-Thompson波动修正对光学电导率的适当非平衡推广。对于超导临界点的失超,我们发现涨落修正导致电导率的幂律老化行为。Azlamazov-Larkin和Maki-Thompson项的幂律老化在性质上是不同的,尽管两者在热平衡的直流测量中的效果相似。这些特征为实验提供了路线图,以确定超导波动在瞬态中的作用。

英文摘要:

There has been significant interest in the generation of very short-lived superconducting states in solid-state films. Here we consider the role of non-equilibrium superconducting fluctuations in such systems, generated by an interaction quench, considering the limit of large static disorder. In particular, we argue that because of critical slowing down, the regime of the fluctuation dominated \emph{normal state} is more important than might be naïvely thought. We show how such a state might appear in the optical conductivity, and give the appropriate non-equilibrium generalization of the Azlamazov-Larkin and Maki-Thompson fluctuation corrections to the optical conductivity. For a quench to the superconducting critical point, we show that the fluctuation corrections lead to power-law aging behavior in the optical conductivity. The power-law aging from Azlamazov-Larkin and Maki-Thompson terms are qualitatively different, despite the effect of the two being similar in dc measurements in thermal equilibrium. These signatures provide a road-map for experiments to identify the role of superconducting fluctuations in a transient state.

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