论文标题
超电流诱导的共振光学响应
Supercurrent induced resonant optical response
论文作者
论文摘要
光导率编码对时间依赖电场的电流响应。在存在直流超电流的情况下，我们开发了光导率$σ（ω）$的理论。伽利亚的不变性禁止在具有单个抛物线带的系统中发生。但是，我们表明晶格效应在Gap Edge $ω=2δ$处产生了$σ（ω）$的明显电流依赖峰，在干净的极限中差异。我们在多波段超导体的模型中证明了这一点。我们的理论解释了Nakamura等人在NBN中对当前引起的峰值的最新观察。 （2019年），并提供了一种新机制，可以通过光直接激活希格斯模式。
The optical conductivity encodes the current response to a time dependent electric field. We develop a theory of the optical conductivity $σ(ω)$ in presence of a dc supercurrent. Current induced optical response is prohibited by Galilean invariance from occurring in systems with a single parabolic band. However, we show that lattice effects give rise to a pronounced current dependent peak in $σ(ω)$ at the gap edge $ω= 2 Δ$, which diverges in the clean limit. We demonstrate this in a model of a multi-band superconductor. Our theory explains the recent observation of a current induced peak in the optical conductivity in NbN by Nakamura et al. (2019), and provides a new mechanism for direct activation of the Higgs mode with light.
