2002/07/31 by Hui Zhao, Sven Wachter, H. Kalt +1
Materials Science · Physics and Astronomy · #Quantum Dots Synthesis And Properties #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.66.085337
published as Phys. Rev. B 66, 085337 (2002) · 6 pages, 4 figures
openalex publication_date 2002/08/30 · arxiv created 2002/09/16 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the homogeneous linewidth of localized type--I excitons in type--II GaAs/AlAs superlattices. These localizing centers represent the intermediate case between quasi-two-dimensional (Q2D) and quasi-zero-dimensional localizations. The temperature dependence of the homogeneous linewidth is obtained with high precision from microphotoluminescence spectra. We confirm the reduced interaction of the excitons with their environment with decreasing dimensionality except for the coupling to LO phonons. The low-temperature limit for the linewidth of these localized excitons is five times smaller than that of Q2D excitons. The coefficient of exciton-acoustic phonon interaction is 5--6 times smaller than that of Q2D excitons. An enhancement of the average exciton--LO-phonon interaction by localization is found in our sample. But this interaction is very sensitive to the detailed structure of the localizing centers.