EXCITONIC OPTICAL-PROPERTIES IN FRACTIONAL-LAYER-SUPERLATTICE WIRE STRUCTURES

We report on the evolution of the excitonic optical features from two dimensions (2D) to one dimension (1D) in GaAs/AlAs fractional-layer-su perlattice (FLS) wire structures. We demonstrate for the first time ho w the excitonic optical properties continuously evolve from 2D to 1D b y introducing the FLS lateral compositional modulation in an AlGaAs qu antum well. We also present a theory numerically analyzing the optical absorption properties in the FLS wires. Present theory accurately rep roduces the experimental results using the AlAs/GaAs FLS wires and cla rifies the main optical features associated with excitons in the inter mediate quantum-confinement regime between 1D and 2D. (C) 1996 America n Institute of Physics.