Diffusion of electron-hole pairs in disordered quantum wires

Moret, N.; Oberli, D. Y.; Dwir, B.; Rudra, A.; Kapon, E.
November 2008
Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p192101
Academic Journal
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 (μPL) 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 μPL spectra disappear at intermediate temperatures, before measurable diffusion occurs.


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