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1
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Inter-Dot Coupling in a Self-Assembled Quantum Dot System

100%
Kazimierczuk T., Nowak S., Suffczyński J., Wojnar P., Golnik A., Gaj J., Kossacki P.
Acta Physica Polonica A
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2007
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vol. 112
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issue 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.
2
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Long Decays of Excitonic Photoluminescence from CdTe/ZnTe Individual Quantum Dots

100%
Piechal B., Suffczyński J., Trajnerowicz A., Goryca M., Kossacki P., Golnik A., Gaj J.
Acta Physica Polonica A
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2005
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vol. 108
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issue 5
831-836
EN
We present time-resolved micro-photoluminescence study of self-assembled CdTe/ZnTe quantum dots. In addition to the fast radiative decay of the exciton, we observe long components, being of the order of a few nanoseconds. We observe that long decays are present for neutral exciton lines as well as on the biexciton ones. The temperature dependent measurements reveal the non-monotonic behaviour. We find also that the long decays are not mono-exponential. We conclude that the dark exciton states cannot be treated as the only source of long decays in the luminescence. We propose other possible explanation, which is the slowing of luminescence by carrier trapping in high energy states in quantum dots and barriers.
3
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Influence of Growth Break before Capping on Photoluminescence Dynamics of CdSe/ZnSe Self-Assembled Quantum Dots

100%
Nowak S., Suffczyński J., Goryca M., Kossacki P., Gaj J., Lee S., Furdyna J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 5
1267-1271
EN
Influence of growth breaks before capping of CdSe self-assembled quantum dot layers on photoluminescence dynamics was examined in three samples. Short (5s) break resulted only in a small blue shift, caused probably by partial strain relaxation and/or Zn interdiffusion. Long (20 min) break induced a strong broadening and red shift of the spectra, combined with a dramatic slow down of the photoluminescence decays. The main result of the long break was identified as introduction of defects (impurities), which generate local electric fields and act as traps of photogenerated carriers.
4
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Photon Correlations and Cross-Correlations from a Single CdTe/ZnTe Quantum Dot

84%
Couteau C., Moehl S., Suffczyński J., Gaj J., Tinjod F., Gérard J., Kheng K., Mariette H., Romestain R., Poizat J.
Acta Physica Polonica A
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2004
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vol. 106
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issue 2
169-176
EN
We report correlation and cross-correlation continuous wave measurements in II-VI quantum dots grown by molecular beam epitaxy. Combination of spectral selection, saturation measurements and good temporal resolution allowed us to see an antibunching effect on photons from radiative recombination of excitons in a single CdTe/ZnTe quantum dot, as well as cross-correlation within the biexciton (X_{2})-exciton (X) radiative cascade from the same dot. We discuss the results of our experiments in terms of a model of excitonic multitransitions.
5
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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.
Acta Physica Polonica A
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2011
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vol. 119
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issue 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.
6
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Optical Properties of CdTe QDs in Proximity to a Surface

84%
Piwowar J., Papierska J., Sawicki K., Kobak J., Pacuski W., Golnik A., Kossacki P., Suffczyński J.
Acta Physica Polonica A
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2013
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vol. 124
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issue 5
795-797
EN
Optical properties of CdTe/ZnTe quantum dots are studied as a function of a capping layer thickness by means of time-integrated and time-resolved microphotoluminescence. The samples are grown by MBE and covered with 10 nm and 100 nm capping layer. Despite that the proximity of the surface may result in an enhanced rate of non-radiative processes limiting the quantum dots optical performance, the set of results indicates that reduction of the capping layer thickness down to 10 nm has no effect on the quantum dot emission intensity and decay rate, contrary to the previously reported case of InAs/GaAs quantum dots.
7
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Magnetooptical Properties of (Ga,Fe)N Layers

68%
Papierska J., Rousset J., Pacuski W., Kossacki P., Golnik A., Nawrocki M., Gaj J., Suffczyński J., Kowalik I., Stefanowicz W., Sawicki M., Dietl T., Navarro-Quezada A., Faina B., Li T., Bonanni A.
Acta Physica Polonica A
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2011
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vol. 120
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issue 5
921-923
EN
Magnetooptical properties of (Ga,Fe)N layers containing various concentrations of Fe-rich nanocrystals embedded in paramagnetic (Ga,Fe)N layers are reported. Previous studies of such samples demonstrated that magnetization consists of a paramagnetic contribution due to substitutional diluted Fe ions as well as of ferromagnetic and antiferromagnetic components originating from Fe-rich nanocrystals, whose relative abundance can be controlled by the growth conditions. The nanocrystals are found to broaden and to reduce the magnitude of the excitonic features. However, the ferromagnetic contribution, clearly seen in SQUID magnetometry, is not revealed by magnetic circular dichroism. Possible reasons for differences in magnetic response determined by magnetic circular dichroism and SQUID measurements are discussed.
8
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Control of Photon Polarization in GaAs/AlAs Single Quantum Dot Emission

68%
Suffczyński J., Trajnerowicz A., Kazimierczuk T., Piętka B., Kowalik K., Kossacki P., Golnik A., Nawrocki M., Gaj J., Wysmołek A., Stępniewski R., Potemski M., Thierry-Mieg V.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
461-466
EN
We study polarization resolved correlation between photons emitted in cascaded biexciton-exciton recombination from a single quantum dot formed in type II GaAs/AlAs bilayer. Magnetic field induced transition from anisotropy controlled to the Zeeman controlled emission was demonstrated by a circular polarization correlation between the emitted photons. A simple model describing the effect allowed us to determine the anisotropic exchange splitting of the excitonic state. This method of the anisotropic exchange splitting determination can be useful in the case when other methods are not sensitive enough.
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