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arXiv 2001.05662cond-mat.supr-con
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非常规超导体中受驱动的Higgs振荡和三次谐波产生理论

Theory of driven Higgs oscillations and third-harmonic generation in unconventional superconductors

Lukas Schwarz, Dirk Manske

摘要:

Higgs谱是研究非平衡超导体中Higgs模以获得基态信息的一个新领域。一个实验装置,其中观察到希格斯模式在s波超导体是周期性驱动太赫兹光,这表明共振的三次谐波产生(THG)信号,如果两倍的驱动频率匹配的能量希格斯模式。我们推导出任意间隙对称的驱动间隙振荡的表达式,并计算了三倍频响应。我们表明,可能的希格斯模式的超导体与非平凡的间隙对称性,可以导致额外的共振,如果两倍的驱动频率匹配的能量,这些希格斯模式,我们解开的影响,电荷密度波动(CDF)的THG信号在我们的清洁限制分析。有了这个,我们表明,非常规超导体的THG实验允许检测其希格斯模式。这为未来的研究铺平了道路,包括额外的功能,了解非常规超导体的集体激发光谱的现实系统。

英文摘要:

Higgs spectroscopy is a new field in which Higgs modes in nonequilibrium superconductors are analyzed to gain information about the ground state. One experimental setup in which the Higgs mode in s-wave superconductors was observed is periodic driving with THz light, which shows resonances in the third-harmonic generation (THG) signal if twice the driving frequency matches the energy of the Higgs mode. We derive expressions of the driven gap oscillations for arbitrary gap symmetry and calculate the THG response. We demonstrate that the possible Higgs modes for superconductors with non-trivial gap symmetry can lead to additional resonances if twice the driving frequency matches the energy of these Higgs modes and we disentangle the influence of charge density fluctuations (CDF) to the THG signal within our clean-limit analysis. With this we show that THG experiments on unconventional superconductors allow for a detection of their Higgs modes. This paves the way for future studies on realistic systems including additional features to understand the collective excitation spectra of unconventional superconductors.

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