Dynamics of excitons in individual InAs quantum dots revealed in four-wave mixing spectroscopy
| Autor: | Mermillod, Q., Wigger, D., Delmonte, V., Reiter, D. E., Schneider, C., Kamp, M., Höfling, S., Langbein, W., Kuhn, T., Nogues, G., Kasprzak, J. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Optica Vol. 3, Issue 4, pp. 377-384 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/OPTICA.3.000377 |
| Popis: | A detailed understanding of the population and coherence dynamics in optically driven individual emitters in solids and their signatures in ultrafast nonlinear-optical signals is of prime importance for their applications in future quantum and optical technologies. In a combined experimental and theoretical study on exciton complexes in single semiconductor quantum dots we reveal a detailed picture of the dynamics employing three-beam polarization-resolved four-wave mixing (FWM) micro-spectroscopy. The oscillatory dynamics of the FWM signals in the exciton-biexciton system is governed by the fine-structure splitting and the biexciton binding energy in an excellent quantitative agreement between measurement and analytical description. The analysis of the excitation conditions exhibits a dependence of the dynamics on the specific choice of polarization configuration, pulse areas and temporal ordering of driving fields. The interplay between the transitions in the four-level exciton system leads to rich evolution of coherence and population. Using two-dimensional FWM spectroscopy we elucidate the exciton-biexciton coupling and identify neutral and charged exciton complexes in a single quantum dot. Our investigations thus clearly reveal that FWM spectroscopy is a powerful tool to characterize spectral and dynamical properties of single quantum structures. Comment: 12 pages, 10 figures |
| Databáze: | arXiv |
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