Gain in quantum cascade lasers and superlattices: A quantum transport theory

Details Gain in quantum cascade lasers and superlattices: A quantum transport theory Gain in quantum cascade lasers and superlattices: A quantum transport theory

2002-07-02

arxiv.org/abs/cond-mat/0207057v1

Physical Review B 66, 085326 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 Pages, 4 Figures directly included, to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.66.085326

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

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