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4 Acta Physica Polonica A

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Numerical Rate Equation Approach to Picosecond Charge State Dynamics in CdTe/ZnTe Quantum Dots

100%

Koperski M. , Kazimierczuk T. , Goryca M. , Wojnar P. , Golnik A. , Kossacki P. , Gaj J.

Acta Physica Polonica A

2009

tom 116

nr 5

893-895

The rate equation is used for description of photoluminescence dynamics after pulsed excitation of various states of quantum dots. The picosecond dynamics of averaged charge state of quantum dot is described. We compare our simulations with the experiment and come up with the conclusion that probability of carrier capture weakly depends on quantum dot charge state and that electrons and holes are captured non-synchronously.

Magnetoluminescence of a CdTe Quantum Dot with a Single Manganese Ion in Voigt Configuration

100%

Koperski M. , Goryca M. , Kazimierczuk T. , Kossacki P. , Wojnar P. , Gaj J.

nr 5

618-620

We present a study of the neutral exciton and negative trion recombination spectra of an individual CdTe quantum dot with a single manganese ion, in magnetic field measured in the Voigt configuration. We describe experimental results and compare with a theoretical model. The quantitative agreement between the model and the experiment allows us to determine separately the electron g-factor.

Spin-Related Spectroscopy of CdTe-Based Quantum Dots

84%

Gaj J. , Kazimierczuk T. , Goryca M. , Koperski M. , Golnik A. , Kossacki P. , Nawrocki M. , Wojnar P. , Karczewski G.

Acta Physica Polonica A

2009

tom 116

nr 5

795-799

This work contains a selection of our recent experimental results in the field of the spin-related spectroscopy of individual CdTe-based quantum dots. After a short description of the sample growth and experimental methods, optical measurements of the charge state dynamics are presented. Then the influence of in-plane anisotropy of the excitonic states of a quantum dot is discussed, followed by a description of experimental studies of information read-out and writing on quantum dot spin states. In particular, spin memory of a single Mn^{++} ion embedded in a CdTe quantum dot is quantitatively assessed. In an outlook part, perspectives opened by recently developed ZnTe lattice-matched Bragg reflectors are discussed.

Excitation Mechanisms of CdTe/ZnTe Quantum Dots under Non-Resonant and Quasi-Resonant Regime

84%

Kazimierczuk T. , Gaj J. , Golnik A. , Goryca M. , Nawrocki M. , Koperski M. , Smoleński T. , Suffczyński J. , Wojnar P. , Kossacki P.

nr 5

588-591

We discuss possible mechanisms of quantum dot population control. A set of experiments, including time-resolved photoluminescence, single photon correlations, excitation correlation, and photoluminescence excitation is used to determine the actual mechanism under non-resonant and quasi-resonant regime.