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A many-body theory based on nonequilibrium Green functions, in whichtransport and optics are treated on a microscopic quantum mechanical basis, isused to compute gain and absorption in the optical and THz regimes in quantumcascade laser structures. The relative importance of Coulomb interactions fordifferent intersubband transitions depends strongly on the spatial overlap ofthe wavefunctions and the specific nonequilibrium populations within thesubbands. The magnitude of the Coulomb effects can be controlled by changingthe operation bias

Controlling many-body effects in the midinfrared gain and terahertz absorption of quantum cascade laser structures