Theory of saturation in a semiconductor with a large carrier recombination frequency

We consider the optical pumping in a semiconductor when the energy of electrons introduced into the conduction band by light is smaller than the frequency of optical phonons. In this case, the inequality vR≫vϵ can also hold, where vR is the recombination frequency, and vϵ is the energy relaxation frequency of the carriers inside the band. We find the linear response to the low-frequency field and the photoconductivity of the semiconductor under saturation conditions for vϵ = 0, and calculate the correction to the stationary distribution function due to phonon scattering for vϵ ≪ vR.

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