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One-dimensional continuum and exciton states in quantum wires

2003; American Institute of Physics; Volume: 82; Issue: 3 Linguagem: Inglês

10.1063/1.1539552

1520-8842

Hidefumi Akiyama, Masahiro Yoshita, L. N. Pfeiffer, Ken West, A. Pinczuk,

Surface and Thin Film Phenomena

High-quality T-shaped quantum wires are fabricated by cleaved-edge overgrowth with 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 (1D) excitons. The PLE spectrum for 1D states shows a large peak of ground-state excitons and a small absorption band ascribed to 1D continuum states with an onset at 11 meV above the exciton peak.