Electron-hole plasma in direct-gap semiconductors

Electron-hole plasma luminescence in direct gap Gasub(1-x)Alsub(x)As has been studied in 2- and 3-dimensionally confined samples. An upper limit of approx. 25 μm to the plasma diffusion length has been determined. Luminescence spectra of uniform, non expanding plasmas have been successfully analyzed in terms of a k-conserving many-body model, in which single-particle energy renormalization and lifetime broadening are included. The values of the gap renormalization are in very good agreement with current theoretical estimates. (Auth.)