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Small. 2012 Jun 11;8(11):1725-31. doi: 10.1002/smll.201200156. Epub 2012 Mar 22.

Ultrafast dynamics of exciton formation in semiconductor nanowires.

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1
Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford, UK.

Abstract

The dynamics of free electron-hole pairs and excitons in GaAs-AlGaAs-GaAs core-shell-skin nanowires is investigated using femtosecond transient photoluminescence spectroscopy at 10 K. Following nonresonant excitation, a bimolecular interconversion of the initially generated electron-hole plasma into an exciton population is observed. This conducting-to-insulating transition appears to occur gradually over electron-hole charge pair densities of 2-4 × 10(16) cm(-3) . The smoothness of the Mott transition is attributed to the slow carrier-cooling during the bimolecular interconversion of free charge carriers into excitons and to the presence of chemical-potential fluctuations leading to inhomogeneous spectral characteristics. These results demonstrate that high-quality nanowires are model systems for investigating fundamental scientific effects in 1D heterostructures.

PMID:
22447674
DOI:
10.1002/smll.201200156
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