飞秒时间分辨动力学Franz-Keldysh效应
Femtosecond time-resolved dynamical Franz-Keldysh effect
摘要：
我们从理论上研究了飞秒时间分辨率下的动态Franz-Keldysh效应，即在强激光场的照射下，带隙附近的介电函数随时间的调制。我们开发了一个泵探测形式主义在两个不同的方法：第一性原理模拟的基础上实时依赖于时间的密度泛函理论和一个简单的两带模型的分析考虑。我们发现，虽然时间平均调制可以合理地描述静态Franz-Keldysh理论，一个显着的相移之间出现的介电响应和所施加的电场。
英文摘要：
We theoretically investigate the dynamical Franz-Keldysh effect in femtosecond time resolution, that is, the time-dependent modulation of a dielectric function at around the band gap under an irradiation of an intense laser field. We develop a pump-probe formalism in two distinct approaches: first-principles simulation based on real-time time-dependent density functional theory and analytic consideration of a simple two-band model. We find that, while time-average modulation may be reasonably described by the static Franz-Keldysh theory, a remarkable phase shift is found to appear between the dielectric response and the applied electric field.
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