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1
Content available remote Temperature of a Single Mn Atom in a CdTe Quantum Dot
100%
Papierska J. , Goryca M. , Wojnar P. , Kossacki P.
Acta Physica Polonica A
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2009
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tom 116
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nr 5
899-900
EN
In this work we present a study of the temperature of the single magnetic atom embedded in a semiconductor quantum dot versus excitation power and magnetic field. This temperature is defined by the thermal distribution of spin states of single Mn ion, and results from its interaction with the neighborhood. This temperature was found to be much higher than the temperature of the thermal bath. Its dependence on the excitation power and magnetic field is discussed.
2
Content available remote Changing the Properties of the CdTe/ZnTe Quantum Dots by in situ Annealing during the Growth
100%
Wojnar P. , Karczewski G. , Wojtowicz T. , Kossut J.
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nr 2
283-288
EN
We present an attempt to control the properties of CdTe/ZnTe self-assembled quantum dots during their formation in the process of molecular beam epitaxy. Namely, the structures were in situ annealed at various temperatures and annealing times after the formation of quantum dots, before the deposition of a capping layer. Depending on the annealing parameters, the dots exhibit different optical properties which were studied by means of spatially resolved photoluminescence. From the analysis of these results, the information about relative changes of the average size and sheet density of quantum dots was extracted.
3
Content available remote Numerical Rate Equation Approach to Picosecond Charge State Dynamics in CdTe/ZnTe Quantum Dots
75%
Koperski M. , Kazimierczuk T. , Goryca M. , Wojnar P. , Golnik A. , Kossacki P. , Gaj J.
Acta Physica Polonica A
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2009
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tom 116
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nr 5
893-895
EN
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.
4
Content available remote Anisotropic Exchange Interaction between p-Shell Electron and s-Shell Hole in CdTe/ZnTe Quantum Dots
75%
Kazimierczuk T. , Golnik A. , Goryca M. , Wojnar P. , Gaj J. , Kossacki P.
Acta Physica Polonica A
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2009
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tom 116
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nr 5
882-884
EN
We study electron-hole exchange interaction in a single CdTe/ZnTe quantum dot by polarization-resolved photoluminescence measurements. We focus on recombination of excitonic states involving p-shell electrons: X^{2-} and XX^-. Recombination lines of X^{2-} and XX^- states exhibit fine structure, which can be consistently explained within a model with four parameters δ_{i}^{αβ} representing strength of iso- and anisotropic parts of interaction between s-hole and s- or p-electron.
5
Content available remote Control of Local Electric Fields Influencing the Photoluminescence οf an Individual CdTe/ZnTe Quantum Dot
75%
Haas K. , Kazimierczuk T. , Wojnar P. , Golnik A. , Gaj J. , Kossacki P.
Acta Physica Polonica A
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2009
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tom 116
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nr 5
896-898
EN
We examine the influence of a weak non-resonant illumination on the quantum dot photoluminescence spectrum. We observe that even very weak illumination affects both intensity and spectral position of emission lines in the spectrum. We discover no significant asymmetry in spatial dependence and infer that the observed effects cannot be attributed to a single neighbor center.
6
Content available remote Inter-Dot Coupling in a Self-Assembled Quantum Dot System
75%
Kazimierczuk T. , Nowak S. , Suffczyński J. , Wojnar P. , Golnik A. , Gaj J. , Kossacki P.
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nr 2
321-324
EN
We present studies of resonant excitation of self-assembled CdTe/ZnTe quantum dots. Photoluminescence excitation measurements revealed existence of sharp resonances, common for photoluminescence lines attributed to different quantum dot charge states. We conclude from the ensemble of photoluminescence and photoluminescence excitation results that we observe energy transfer in coupled quantum dot pairs.
7
Content available remote Magnetoluminescence of a CdTe Quantum Dot with a Single Manganese Ion in Voigt Configuration
75%
Koperski M. , Goryca M. , Kazimierczuk T. , Kossacki P. , Wojnar P. , Gaj J.
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nr 5
618-620
EN
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.
8
Content available remote Spin-Related Spectroscopy of CdTe-Based Quantum Dots
63%
Gaj J. , Kazimierczuk T. , Goryca M. , Koperski M. , Golnik A. , Kossacki P. , Nawrocki M. , Wojnar P. , Karczewski G.
Acta Physica Polonica A
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2009
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tom 116
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nr 5
795-799
EN
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.
9
Content available remote TEM Study of the Structural Properties of Nanowires Based on Cd, Zn, Te grown by MBE on Silicon Substrates
63%
Kaleta A. , Kret S. , Sanchez A. , Bilska M. , Kurowska B. , Szczepańska A. , Płachta J. , Wojnar P. , Wojciechowski T.
Acta Physica Polonica A
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2017
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tom 131
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nr 5
1399-1405
EN
In this work we report on the atomic structures, elemental distribution, defects and dislocations of three types of semiconductor nanowires: ZnTe, CdTe, and complex ZnTe/(Cd,Zn)Te core/shell hetero-nanowires grown by a molecular beam epitaxy on (111) Si substrate using a vapor-liquid-solid mechanism. The structural properties and the chemical gradients were measured by transmission electron microscopy methods. The nanowires reveal mainly sphalerite structure, however wurtzite nanowires were also observed.
10
Content available remote Influence of Configuration Mixing on Energies and Recombination Dynamics of Excitonic States in CdTe/ZnTe Quantum Dots
63%
Smoleński T. , Kazimierczuk T. , Goryca M. , Kossacki P. , Gaj J. , Wojnar P. , Fronc K. , Korkusiński M. , Hawrylak P.
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nr 5
615-617
EN
We study experimentally and theoretically excitonic recombination processes in CdTe/ZnTe quantum dots. The single quantum dot photoluminescence spectrum was observed and emission lines from X, X^-, X^+ and 2X excitonic states were identified. Experimental results were analysed in the theoretical model based on the effective mass approximation. Numerical calculations of energy positions and recombination probabilities of X, X^-, X^+ and 2X were performed. Computed results reproduce correctly the order and relative positions of emission lines and ratios of radiative lifetimes.
11
Content available remote Excitation Mechanisms of CdTe/ZnTe Quantum Dots under Non-Resonant and Quasi-Resonant Regime
63%
Kazimierczuk T. , Gaj J. , Golnik A. , Goryca M. , Nawrocki M. , Koperski M. , Smoleński T. , Suffczyński J. , Wojnar P. , Kossacki P.
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nr 5
588-591
EN
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.
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