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Proceedings Paper

Carrier and spin dynamics in charged quantum dots
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Paper Abstract

Carrier and spin dynamics are measured in meutral, positively and negatively charged quantum dots using polarization-sensitive time-resolved photoluminescence. Carrier capture rates are observed to be strongly enhanced in charged quantum dots, suggesting that electron-hole scattering dominates this process. For positive quantum dots, the enhanced spin-polarized electron capture rate eliminates loss of electron spin information in the GaAs barriers prior to capture, resulting in strong circularly-polarized emission. Comparison of spin relaxation times in positively charged and neutral quantum dots reveals a negligible influence of the large built-in hole population, in contrast to measurements in higher-dimensional p-type semiconductors. The long spin life-time, short capture time, and high radiative efficiency of the positively charged quantum dots indicates that these structures are superior to both quantum wells and neutral quantum dots for spin detection using a spin light-emitting diode.

Paper Details

Date Published: 14 June 2004
PDF: 12 pages
Proc. SPIE 5361, Quantum Dots, Nanoparticles, and Nanoclusters, (14 June 2004); doi: 10.1117/12.531620
Show Author Affiliations
Kimberley C. Hall, Univ. of Iowa (United States)
Kenan Gundogdu, Univ. of Iowa (United States)
Thomas F. Boggess, Univ. of Iowa (United States)
Oleg B. Shchekin, Univ. of Texas/Austin (United States)
Dennis G. Deppe, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 5361:
Quantum Dots, Nanoparticles, and Nanoclusters
Diana L. Huffaker; Pallab Bhattacharya, Editor(s)

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