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Binding Energies of Excitons in Quantum Well Structures

100%
Neugebauer F., Suisky D., Heimbrodt W.
Acta Physica Polonica A
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1998
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vol. 94
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issue 3
459-462
EN
Binding energies of excitons in quantum well structures have been studied by solving the time-dependent Schrödinger equation where the potential is made up by the confining quantum well potentials of arbitrary form and the Coulomb interaction between the electron and hole. The problem is solved without the usually assumed variational procedure and the separation ansatz for the confined electron and hole states. The wave functions for electrons and holes can be extracted from the exciton wave function and are used for the interpretation of the charge localization.
2
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Dynamics of Light Emission in CdMnS Nanoparticles

76%
Godlewski M., Yatsunenko S., Drozdowicz-Tomsia K., Goldys E., Phillips M., Klar P., Heimbrodt W.
Acta Physica Polonica A
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2005
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vol. 108
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issue 4
681-688
EN
We demonstrate coexistence of slow and fast components of photoluminescence decay of the Mn^{2+} intra-shell emission in nanoparticles of CdMnS. We explain the observed decrease in PL lifetime of the Mn^{2+} intra-shell transition by high efficiency of spin dependent magnetic interactions between localized spins of Mn^{2+} ions and free carriers. This mechanism is enhanced in nanostructures, but it is also present in bulk samples.
3
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Origin of Ultrafast Component of Photoluminescence Decay in Nanostructures Doped with Transition Metal or Rare-Earth Ions

64%
Godlewski M., Yatsunenko S., Ivanov V., Khachapuridze A., Świątek K., Goldys E., Phillips M., Klar P., Heimbrodt W.
Acta Physica Polonica A
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2005
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vol. 107
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issue 1
65-74
EN
Bulk samples, layers, quantum well, and quantum dot structures of II-Mn-VI samples all show coexistence of slow and fast components of Mn^{2+} photoluminescence decay. Thus, fast photoluminescence decay cannot be related to low dimensionality of a host material. This also means that the model of the so-called quantum confined atom is incorrect. Based on the results of time-resolved photoluminescence and optically detected magnetic resonance investigations we relate the observed lifetime decrease in Mn^{2+} intra-shell transition to spin dependent magnetic interactions between localized spins of Mn^{2+} ions and between Mn^{2+} ions and spins/magnetic moments of free carriers. The latter mechanism is enhanced in nanostructures.
4
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Spin Dependent Interactions of Free Carriers and Manganese Ions in Nanostructures of Wide Band Gap II-Mn-VI Semiconductors - Mechanism of Lifetime Reduction

52%
Yatsunenko S., Khachapuridze A., Ivanov V., Godlewski M., Khoi L., Gołacki Z., Karczewski G., Goldys E., Phillips M., Klar P., Heimbrodt W.
Acta Physica Polonica A
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2003
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vol. 103
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issue 6
643-648
EN
Based on the results of optically detected magnetic resonance and time-resolved investigations we relate the observed lifetime shortening of intra-shell Mn^{2+} emission to spin dependent magnetic interactions between localized spins of Mn^{2+} ions and spins/magnetic moments of free carriers. We show that this mechanism is active in both bulk and in low dimensional structures, such as quantum wells, quantum dots, and nanostructures.
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