Publication # 099

C. Weber, C. Klingshirn, D. S. Chemla, D. A. B. Miller, and J. E. Cunningham, "Gain measurement and band-gap renormalization in GaAs/Alx Ga1-xAs multiple-quantum-well structures, Phys. Rev. B, 38, 12748-12751, (1988).

Using a pump and probe technique with nanosecond excitation pulses the authors measure the nonlinear optical properties of GaAs/Al/sub 0.3/Ga/sub 0.7/As multiple-quantum-well (MQW) structures under quasistationary excitation conditions. The main aspects of their work are the phenomena of optical gain, the renormalization of the fundamental band gap and of the higher subbands (n/sub z/=2, n/sub z/=3), due to the electron-hole population of the lowest (n/sub z/=1) subbands. They present the first systematic analysis of the gain spectra to determine the renormalization of the n/sub z/=1 subband and interpret the data in terms of effective exciton parameters in combination with a pure two-dimensional theory

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