Monolayer fluctuations in ultrathin, coherently strained CdS/ZnS quantum structures result in a very strong localization of excitons. The deepest localized excitons can be considered as individual, decoupled and three-dimensionally confined. Consequently, fingerprints of zero-dimensionality are found in the optical spectra like single, ultranarrow luminescence lines in micro-photoluminescence and spectrally broad optical gain in the deep blue spectral range. The exchange splitting is proven and a strong enhancement over the bulk value is observed.
|Journal||IPPS physica status solidi (b)|
|Publication status||Published - 1998|