论文标题
Bafe $ _2 $的瞬态间隙生成AS $ _2 $由连贯的晶格振动驱动
Transient gap generation in BaFe$_2$As$_2$ driven by coherent lattice vibrations
论文作者
论文摘要
基于铁的超导体的电子结构和磁性对Pnictogen高度高度敏感。飞秒激光对$ a_ {1g} $声子的连贯激发直接调节PNICTEGON高度，该高度已用于控制基于铁的超导体的物理性能。先前的研究表明，驱动的$ a_ {1g} $声子导致bafe $ _2 $ as $ _2 $的Pnictogen高度的短暂增加，有利于增强的Fe磁矩。在这里，我们使用时间分辨的宽带Terahertz光谱法调查Bafe $ _2 $的动态为$ a_ {1g} $ Phonon驱动状态中的$ _2 $。在旋转密度波（SDW）过渡温度下方，我们在早期延迟时观察到瞬态间隙产生。直到室温到室温，在正常状态下观察到类似的瞬态特征。
The electronic structure and the magnetic properties of iron-based superconductors are highly sensitive to the pnictogen height. Coherent excitation of the $A_{1g}$ phonon by femtosecond laser directly modulates the pnictogen height, which has been used to control the physical properties of iron-based superconductors. Previous studies show that the driven $A_{1g}$ phonon resulted in a transient increase of the pnictogen height in BaFe$_2$As$_2$, favoring an enhanced Fe magnetic moment. Here, we use time-resolved broadband terahertz spectroscopy to investigate the dynamics of BaFe$_2$As$_2$ in the $A_{1g}$ phonon driven state. Below the spin-density wave (SDW) transition temperature, we observe a transient gap generation at early time delays. A similar transient feature is observed in the normal state up to room temperature.
