  High-quality T-shaped quantum wires are fabricated by cleaved-edge overgrowth
with the molecular beam epitaxy on the interface improved by a growth-interrupt
high-temperature anneal. Characterization by micro-photoluminescence (PL) and
PL excitation (PLE) spectroscopy at 5 K reveals high uniformity, a sharp
spectral width, and a small Stokes shift of one-dimensional (1-D) excitons. The
PLE spectrum for 1-D states shows a large peak of ground-state excitons and a
small absorption band ascribed to 1-D continuum states with an onset at 11 meV
above the exciton peak.

Mesoscale and Nanoscale Physics;Materials Science