Phonon interaction of single excitons and biexcitons
| Autor: | Wolfgang Werner Langbein, Ulrike Woggon, Konstanze Hild, F. Gindele |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Physics
Condensed matter physics Condensed Matter::Other Phonon Exciton Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Coupling (probability) Epitaxy Condensed Matter::Materials Science Laser linewidth Quantum dot Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Atomic physics Biexciton |
| Zdroj: | Physical Review B. 60:R2157-R2160 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | The exciton-phonon coupling of a single zero-dimensional exciton is studied in epitaxially grown ${\mathrm{C}\mathrm{d}\mathrm{S}\mathrm{e}/\mathrm{Z}\mathrm{n}}_{1\ensuremath{-}x}{\mathrm{Cd}}_{x}\mathrm{Se}$ quantum dot structures by analyzing its linewidth and phonon-assisted recombination. The single excitons do not couple to only a single phonon mode, but to a distribution of phonons, here consisting of the zone-center ZnSe longitudinal optic (LO) phonon and of mixed modes with an energy statistics centered between the ZnSe and CdSe LO phonon. Both exciton and corresponding biexciton reveal LO-phonon replica intensities of $\ensuremath{\sim}3%$ of the respective zero-phonon emission. These similar LO-phonon coupling strengths are evidence of a reduced polarity of the exciton states within the biexciton as the result of exciton-exciton correlation. |
| Databáze: | OpenAIRE |
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