固体中带内谐波的多电子干涉
Multielectron interference of intraband harmonics in solids
摘要：
固体中的高次谐波产生为我们提供了紧凑和相干的紫外光源。我们的模拟说明了异常的谐波产量的驱动或预激励脉冲的强度依赖。提出了一个多电子干涉模型来揭示极端非线性光学现象的机理。我们发现，$k$解决的带内谐波表现出不同的对称性，相位和振幅，这可以通过使用共振预激发脉冲观察。通过求解半导体Bloch方程得到的干涉极小值的位置与我们的$k$ -分辨半经典模型得到的干涉极小值的位置一致。这种干涉模型可以帮助我们探测$k$的能带结构，优化固体谐波过程的超快电子-空穴动力学。
英文摘要：
High harmonic generation in solids provides us compact and coherent UV sources. Our simulations illustrate abnormal harmonic yield dependence on the intensity of driving or pre-excitation pulses. A multielectron interference model is proposed to reveal the mechanism of the extreme nonlinear optical phenomena. We find that the $k$-resolved intraband harmonic demonstrates different symmetry, phase, and amplitude, which can be observed by using a resonant pre-excitation pulse. The position of the interference minimum obtained by solving the semiconductor Bloch equations agrees well with that obtained by our $k$-resolved semiclassical model. This interference model can help us probe the $k$-resloved band structure and optimize the ultrafast electron-hole dynamics for solid harmonic processes.
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