Gain in quantum cascade lasers and superlattices: A quantum transport theory
arXiv:cond-mat/0207057 · doi:10.1103/PhysRevB.66.085326
Abstract
Gain in current-driven semiconductor heterostructure devices is calculated within the theory of nonequilibrium Green functions. In order to treat the nonequilibrium distribution self-consistently the full two-time structure of the theory is employed without relying on any sort of Kadanoff-Baym Ansatz. The results are independent of the choice of the electromagnetic field if the variation of the self-energy is taken into account. Excellent quantitative agreement is obtained with the experimental gain spectrum of a quantum cascade laser. Calculations for semiconductor superlattices show that the simple 2-time miniband transport model gives reliable results for large miniband widths at room temperature
8 Pages, 4 Figures directly included, to appear in Physical Review B
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Cited by in corpus (21)
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