PHOTOLUMINESCENCE EXCITATION-SPECTRA IN GAAS ALAS TRENCH-BURIED QUANTUM WIRES WITH 20 NM WIDE RECTANGULAR CROSS-SECTIONAL SHAPES/

Polarization-dependent photoluminescence excitation spectra (PLE) are measured in GaAs/AlAs rectangular trench-buried quantum wires (QWRs) w ith 20 nm width and various thicknesses. Experiments demonstrate that the polarization properties of the PLE spectra, which have several cle ar peaks corresponding to the optical transitions between quantized co nduction and valence subbands, significantly depend on the cross-secti onal ratios of the rectangular wires. Quantum indices of these transit ion levels are assigned by comparing the experiments with theory. The distinctive optical features of the QWRs with the rectangular cross se ctions are discussed in relation to the characteristics of one-dimensi onal valence subbands. (C) 1996 American Institute of Physics.