Beyond the effective mass approximation: A predictive theory of the nonlinear optical response of conduction electrons

Article

关键词: IMPACT IONIZATION;    TERAHERTZ PULSES;    BAND-STRUCTURE;    INSB;    DEPENDENCE;    THZ;    SEMICONDUCTORS;    SPECTROSCOPY;    INSULATOR;    GAAS;   

DOI  :  10.1103/PhysRevB.95.125201

来源: SCIE

【 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 nonlinear THz propagation 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 modeling of the conduction-electron optical nonlinearity that governs the THz propagation in semiconductors.

【 授权许可】

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