SUBBAND RENORMALIZATION IN DENSE ELECTRON-HOLE PLASMAS IN IN0.53GA0.47AS INP QUANTUM WIRES/

In0.53Ga0.47As/InP quantum wires have been investigated by cw high-exc itation luminescence spectroscopy. Quantum-wire states up to the edge of the InP conduction band have been populated in the dense neutral el ectron-hole plasma. Up to three lateral subband transitions are clearl y observed in the luminescence spectra. By using calculated line shape s, the temperature and the density:of the e-h plasma as well as the ba nd-gap reduction of the different lateral subbands have been determine d. We observe a clear dependence of the renormalization on the subband index, which is traced to the density dependence of the exchange ener gy.