Origin of emission energy blue shift in a 1.3 μm GaAsSb type-II quantum well

Blue shift of the emission peak with increasing injection current in a type-II quantum well was investigated experimentally and theoretically. The experiment was modeled using the microscopic theory by computing the band structure and incorporating the charge separation and band-distortion effects. Quantum kinetic equations at the level of the second Born approximation in the Markovian limit was used for dephasing and plasma screening due to carrier-carrier correlations. The interplay of the competing effects of type-II quantum confinement and the resulting Coulomb attraction and distortion were found to be responsible for the blue shift.