Band-gap renormalization and band-filling effects in a homogeneous electron-hole plasma in In0.53Ga0.47As/InP single quantum wells.

By use of homogeneously excited small mesa structures a highly uniform electron-hole plasma (EHP) is created by cw excitation of ${\mathrm{In}}_{\mathrm{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$As/InP single-quantum-well (SQW) structures. Because of the high homogeneity of the EHP in space and time we observe many-body effects and band filling under very clear experimental conditions. Our luminescence measurements demonstrate the subband dependence of the band-gap renormalization and a strong dependence of the band-gap reduction on the width of the ${\mathrm{In}}_{\mathrm{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$As/InP SQW's.