Optical and transport studies of hot electrons in modulation-doped quantumwires

We describe recent progress in producing quantum wires by modulation-doping v-groove structures. Strong lateral confinement is observed, with subband energy separation of 40 meV. The high quality ID electron system shows pron ounced singularities in the photoluminescence spectrum near the Fermi energ y. Energy relaxation has been investigated by electrical heating, where we find clear evidence of LO-phonon scattering and real space transfer. Time-r esolved photoluminescence reveals intersubband relaxation within the 1D lev els. (C) 1999 Published by Elsevier Science B.V. All rights reserved.