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Theory of the generation and detection of carriers in ultrafast pump-and-probe spectroscopy of semiconductors

1996; American Institute of Physics; Volume: 80; Issue: 10 Linguagem: Inglês

10.1063/1.363585

1520-8850

Alex V. Kuznetsov, Chang Sub Kim, Christopher J. Stanton,

Semiconductor Quantum Structures and Devices

We present an analysis of several of the factors that contribute to experimentally measured pump-probe spectra. We point out that for a correct description of the carrier generation, a full quantum mechanical description is essential. In addition, we discuss the regimes where the quantum mechanical description based on the Bloch equations can be replaced by a simplified semiclassical approach. We also demonstrate that the detection of nonequilibrium carrier distributions with the probe pulse is a nontrivial process due to quantum effects, and derive expressions for the detected signal for different experimental schemes.