EXCITONIC OPTICAL-PROPERTIES IN FRACTIONAL-LAYER-SUPERLATTICE WIRE STRUCTURES IN THE INTERMEDIATE CONFINEMENT REGIME BETWEEN 2 DIMENSIONS AND ONE-DIMENSION

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 present a theory numerically anal yzing the excitonic optical-absorption properties in the FLS wires. Wi th our calculation method we can treat any FLS wire shape with arbitra ry dimension from 2D to 1D and can analyze in detail The excitonic opt ical properties in the intermediate quantum-confinement regime between 1D and 2D. We also experimentally demonstrate how the excitonic optic al properties continuously evolve from 2D to 1D by introducing the FLS lateral compositional modulation in an AlxGa1-xAs quantum well. Prese nt theory accurately reproduces the experimental results using the GaA s/AlAs FLS wires and clarifies the main optical features associated wi th excitons in the intermediate regime.