Many body theory of THz intervalence gain in quantum wells
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Abstract
This paper presents calculations of THz gain in III–V quantum wells based on transitions between the valence bands. The system is out of equilibrium and the optical susceptibility leading to absorption and gain is calculated after a Keldysh nonequilibrium Greens’ functions approach. The relevance of many body and nonresonant contribution to the spectrum is discussed as a function of local population inversion in k-space for a system where the injected holes are distributed within the two lowest subbands without global population inversion.
Keywords
THz gain THz lasers Intersubband optics Lasing without inversion Nonequilibrium physics Intervalence band transitionsPACS
71.36.+c 71.10.-w 73.31.FgPreview
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