Light-induced enhancement of superconductivity in iron-based superconductor FeSe0.5Te0.5
Light-induced enhancement of superconductivity in iron-based superconductor FeSe0.5Te0.5
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DOI：
10.1038/s42005-021-00663-8
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发表时间：
2021-07-14
影响因子：
5.5
通讯作者：
Shimano, Ryo
中科院分区：
文献类型：
--
作者：
Isoyama, Kazuki;Yoshikawa, Naotaka;Shimano, Ryo
光-物质相互作用不仅用于熔化电子秩序，而且还具有作为非热调谐旋钮增强紧急秩序的潜力。在这里，作者通过注入光载流子产生太赫兹三次谐波和太赫兹光导，证明了硫系铁超导体中超导性的光诱导瞬态增强。光照在物质上通常会引起加热并破坏有序的基态。尽管有这种普遍的理解，但超快光源的最新进展使量子相的非热控制成为可能。本文报道了硫系铁FeSe0.5Te0.5薄膜在光诱导下的超导性增强，该薄膜表现出与多轨道特性相关的多重量子凝聚。光激发后，我们观察到超流体密度在超导间隙频率范围内的瞬态增加。超导电性的光诱导增强被太赫兹三次谐波产生的光诱导增强进一步证实，这是由希格斯模式响应引起的。频率和时间分辨太赫兹测量揭示了两种超流体组分的超快动力学，表明冷凝物之间通过带间库珀对相互作用，同时表明光在超快时间尺度上对相互作用的潜在可调性。
Light-matter interaction is not only used to melt electronic orders, but also carry the potential as a non-thermal tuning knob to enhance emergent orders. Here the authors demonstrate a light-induced transient enhancement of superconductivity in an iron chalcogenide superconductor via terahertz optical conductivity and terahertz third-harmonic generation by the injection of photo-carriers.Illumination of light on matter normally causes heating and destroys the ordered ground states. Despite this common understanding, recent advances in ultrafast light sources have enabled the non-thermal control of quantum phases. Here, we report the light-induced enhancement of superconductivity in a thin film of an iron chalcogenide FeSe0.5Te0.5, which exhibits multiple quantum condensates associated with the multi-orbital character. Upon the photoexcitation, we observed a transient increase of the superfluid density as indicated by the optical conductivity in the frequency range of superconducting gaps. The light-induced enhancement of superconductivity is further corroborated by the photoinduced enhancement of terahertz third harmonic generation, which is accounted for by the Higgs mode response. The ultrafast dynamics of two superfluid components revealed by frequency- and time-resolved terahertz measurements indicate the interplay between the condensates through the interband Cooper pairings while suggesting the potential tunability of the pairing interaction by light in the ultrafast timescale.