Excitons localized at compositional potential fluctuations are individually resolved by spatially resolved near-field luminescence in ZnCdSe/ZnSe quantum wells at room temperature. Localization is found to occur on a scale length of about 100 nm, in Cd-rich clusters in which the local Cd content varies by approximately 1% with respect to the nominal composition, and in steps of about 0.3%. A microscopic modeling of the localized exciton states is presented, which describes quite well the observed near-field spectra. (C) 1999 American Institute of Physics. [S0021-8979(99)00524-1].
Spatially resolved near-field photoluminescence spectroscopy of II-VI quantum wells: The role of localized excitons
FUSO, FRANCESCO;ALLEGRINI, MARIA;
1999-01-01
Abstract
Excitons localized at compositional potential fluctuations are individually resolved by spatially resolved near-field luminescence in ZnCdSe/ZnSe quantum wells at room temperature. Localization is found to occur on a scale length of about 100 nm, in Cd-rich clusters in which the local Cd content varies by approximately 1% with respect to the nominal composition, and in steps of about 0.3%. A microscopic modeling of the localized exciton states is presented, which describes quite well the observed near-field spectra. (C) 1999 American Institute of Physics. [S0021-8979(99)00524-1].File in questo prodotto:
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