Diffusion of electron-hole pairs in disordered quantum wires

The diffusivity of photogenerated electron-hole pairs in weakly disordered GaAs/AlGaAs V-groove quantum wires was measured using a photoluminescence (PL) time-of-flight technique. It is shown that the electron-hole pair diffusion is thermally activated above about 50 K. Exciton localization is observed in micro-PL (mu PL) spectra at low temperature. A reduction in the Stokes shift is found to accompany the increase in the diffusion coefficient. Nevertheless, localization-related features in the mu PL spectra disappear at intermediate temperatures, before measurable diffusion occurs.


Published in:
Applied Physics Letters, 93, 192101
Year:
2008
Publisher:
American Institute of Physics
ISSN:
0003-6951
Keywords:
Laboratories:




 Record created 2010-03-26, last modified 2018-03-17


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