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Theory of the spectral line shape and gain in quantum wells with intersubband transitions
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11.This is a reasonable model for the experimental conditions reported in Refs. 123, where the average carrier concentration per period ) is sufficiently high to establish a uniform throughout the entire period (∼400 Å). A very interesting situation arises in the opposite limit of low carrier concentrations, where the rate of electron-electron collisions is too low to establish Maxwellian distribution functions in the two subbands. In this limit (Ref. 5), the existence of a positive gain persists to concentrations far from an overall inversion and does not rely on the nonparabolicity.
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