椭圆极化laser下的时间分辨动力学Franz-Keldysh效应
Time-resolved dynamical Franz-Keldysh effect under elliptically polarized laser
摘要：
报道了亚飞秒时间尺度下椭圆偏振激光作用下的时间分辨动力学Franz-Keldysh效应（Tr-DFKE）的解析表达式。假设Houston函数为抛物型双带系统的含时波函数。结果表明，椭圆偏振的光学性质的子周期变化，介电函数的调制变得比线偏振的小。另一方面，对于圆偏振激光，介电函数的子周期调制消失，这是Tr-DFKE的一个显著特征。该解析公式与金刚石含时密度泛函理论的第一性原理计算结果定性一致。
英文摘要：
The analytical formula for the time-resolved dynamical Franz-Keldysh effect (Tr-DFKE) under an elliptically polarized laser in sub-femtosecond time-scale is reported. The Houston function is assumed as the time-dependent wave function of the parabolic two-band system. The resulting formula shows the sub-cycle change of the optical properties for elliptically polarization; the modulation of the dielectric function becomes smaller than that of linear polarization. On the other hand, the subcycle modulation of the dielectric function disappears for a circularly polarized laser, which is a significant feature of the Tr-DFKE. This analytical formulas show good qualitative agreement with the first-principle calculation employing the time-dependent density functional theory for diamond.
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