科研之友
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摘要
The dynamics of free electronhole pairs and excitons in GaAsAlGaAsGaAs coreshellskin nanowires is investigated using femtosecond transient photoluminescence spectroscopy at 10 K. Following nonresonant excitation, a bimolecular interconversion of the initially generated electronhole plasma into an exciton population is observed. This conducting-to-insulating transition appears to occur gradually over electronhole charge pair densities of 24 x 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.
- 出版日期2012-6-11
