超越有效质量近似：传导电子非线性光学响应的预测理论
Beyond the effective mass approximation: predictive theory of the nonlinear optical response of conduction electrons
摘要：
本文对传导电子在太赫兹电场作用下的非线性光学响应进行了实验和计算研究。我们的观察结果（饱和吸收和振幅依赖的基团折射率）可以理解的有效质量近似的故障的定性水平。然而，预测的非线性理论描述一直失踪。我们提出了一个基于半经典电子动力学模型，一个现实的能带结构，和自由电子Drude参数准确计算的实验观测值在InSb。我们的研究结果开辟了一条道路，半导体，超材料，以及在太赫兹等离子体的高场效应的导电电子光学非线性的预测建模。
英文摘要：
We present an experimental and computational study of the nonlinear optical response of conduction electrons to intense terahertz (THz) electric field. Our observations (saturable absorption and an amplitude-dependent group refractive index) can be understood on the qualitative level as the breakdown of the effective mass approximation. However, a predictive theoretical description of the nonlinearity has been missing. We propose a model based on the semiclassical electron dynamics, a realistic band structure, and the free electron Drude parameters to accurately calculate the experimental observables in InSb. Our results open a path to predictive modeling of the conduction-electron optical nonlinearity in semiconductors, metamaterials, as well as high-field effects in THz plasmonics.
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