论文标题
内映动力学在固体产生圆形极化高谐波中的作用
The role of intraband dynamics in the generation of circularly polarized high harmonics from solids
论文作者
论文摘要
最近的研究表明，固体高谐波的极化状态与驱动脉冲的极化不同。为了获得对这种行为的显微镜起源的见解，我们执行单粒子的仅标准计算并重现一些最引人注目的观察结果。例如，我们的计算产生了敏感依赖驱动条件的椭圆极化脉冲的循环极化谐波。此外，我们对ZnS进行实验，并发现硅报道的部分相似的特征。与我们的仅标准计算的比较显示了与频段间隙谐波的合理定性一致性。我们表明，内的动力学预测了更高场强度的去极化效应。对于频带间隙上方的谐波，带间动力学变得重要，并且对椭圆激发的高谐波反应在系统上不同。我们的工作提出了一种区分不同高谐波生成机制的方法，它可以为具有可控极化状态的固态高谐波源铺平道路。
Recent studies have demonstrated that the polarization states of high harmonics from solids can differ from those of the driving pulses. To gain insights on the microscopic origin of this behavior, we perform one-particle intraband-only calculations and reproduce some of the most striking observations. For instance, our calculations yield circularly polarized harmonics from elliptically polarized pulses that sensitively depend on the driving conditions. Furthermore, we perform experiments on ZnS and find partly similar characteristics as reported from silicon. Comparison to our intraband-only calculations shows reasonable qualitative agreement for a below-band-gap harmonic. We show that intraband dynamics predict depolarization effects for higher field strengths. For harmonics above the band gap, interband dynamics become important and the high-harmonic response to elliptical excitation looks systematically different. Our work proposes a method to distinguish between different high-harmonic generation mechanisms and it could pave the way to compact solid-state high-harmonic sources with controllable polarization states.
