MULTIBAND BLOCH EQUATIONS AND GAIN SPECTRA OF HIGHLY EXCITED II-VI SEMICONDUCTOR QUANTUM-WELLS

Quasi-equilibrium excitation dependent optical probe spectra of II-VI semiconductor quantum wells at room temperature are investigated withi n the framework of multi-band semiconductor Bloch equations. The calcu lations include correlation effects beyond tile Hartree-Fock level whi ch describe dephasing, interband Coulomb correlations and band-gap ren ormalization in second Born approximation. In addition to the carrier- Coulomb interaction, the influence of carrier-phonon scattering and in homogeneous broadening is considered. The explicit calculation of sing le particle properties like band structure and dipole matrix elements using k.p theory makes it possible to investigate various II-VI materi al combinations. Numerical results are presented for CdZnSe/ZnSe and C dZnSe/MgZnSSe semiconductor quantum-well systems.