Gain in quantum cascade lasers and superlattices: A quantum transport theory
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
Keywords
Cite
@article{arxiv.cond-mat/0207057,
title = {Gain in quantum cascade lasers and superlattices: A quantum transport theory},
author = {Andreas Wacker},
journal= {arXiv preprint arXiv:cond-mat/0207057},
year = {2009}
}
Comments
8 Pages, 4 Figures directly included, to appear in Physical Review B