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Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics

Single photon correlation measurements in a study of excitation process of individual CdTe/ZnTe quantum dots

J. Suffczyński, T. Kazimierczuk, M. Goryca, Artur Trajnerowicz, K. Kowalik, P. Kossacki, A. Golnik, M. Nawrocki, J. A. Gaj, G. Karczewski

Published Nov 22, 2006• 1 citation
Publisher

Abstract

Abstract We present the results of systematic autocorrelation and cross‐correlation measurements performed on photons originating from various excitonic transitions in a single CdTe/ZnTe quantum dot (QD). Excitation power dependence of photoluminescence intensity was also measured on the same dot under the same experimental conditions. Recorded correlation histograms have provided evidence for memory effects in QD photoluminescence extending over a few excitation periods. Rate equation model assuming a ladder of states and excitation through a single carrier and exciton capture, is fitted to the data. As a consequence, simultaneous quantitative description of the results of both, correlation and power dependence, is obtained. Strong evidence is presented for a QD excitation by capture of single carriers rather than entire excitons. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI
10.1002/pssc.200671507

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