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  1. 36 Acta Physica Polonica A

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  1. 36 Golnik A.

  2. 28 Kossacki P.

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1
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Muon Spin Rotation in High T_{c} Superconductors

100%
Golnik A.
Acta Physica Polonica A
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1993
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vol. 84
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issue 1
165-192
EN
A review of the muon spin rotation studies on high temperature superconductors is presented, with the special emphasis on the investigations of the magnetic ordering and spin-spin correlations in these materials.
2
Publication available in full text mode
Content available

Time-Resolved Studies of Excitonic Dynamics in a Wide II-VI Quantum Well by a Femtosecond Pump-Probe Reflectivity

46%
Trajnerowicz A., Golnik A., Kossacki P., Pacuski W., Wojtowicz T.
Acta Physica Polonica A
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2006
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vol. 110
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issue 3
395-401
EN
We present time-dependent reflectance spectra of wide (Cd,Mn)Te/(Cd,Mg)Te quantum wells. Interactions between excitons, trions, and carriers are studied for exciton densities up to 10^{11} cm^{-2}. The resonant excitation at different excitonic lines is analyzed.
3
Content available remote

Scattering Dynamics of Free Excitons on Fe^{++} Ions in Cd_{1-x}Fe_{x}Se

46%
Gaj J., Nguyen K., Nawrocki M., Golnik A., Lebecki K.
Acta Physica Polonica A
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1991
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vol. 80
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issue 3
409-412
EN
Inelastic scattering of excitons on Fe^{++} ions in Cd_{1-x}Fe_{x}Se was studied by resonant Raman scattering. Polarization measurements were done using a modulation technique, allowing for the first time to determine the full polarization state of the detected light. The obtained results were compared to a simple calculation in an incoherent model of scattering on Fe^{++} ions.
4
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Signatures of p-Shell Electron g-Factor in s-Shell Emission of CdTe/ZnTe Quantum Dots

40%
Kazimierczuk T., Goryca M., Wojnar P., Golnik A., Nawrocki M., Kossacki P.
Acta Physica Polonica A
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2011
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vol. 120
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issue 5
874-876
EN
We analyze the photoluminescence of excitonic complexes containing p-shell electron in the magnetic field in the Faraday configuration. We demonstrate that despite the p-shell electron is not involved directly in the recombination process, its g-factor influences the emission spectrum. We found that in the case of CdTe/ZnTe quantum dots the p-shell electron is significantly less affected by the magnetic field than s-shell electron in the same dot.
5
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Cold and Hot Excitons in CdMnTe/CdMgTe Quantum Wells in Strong Excitation Regime and External Magnetic Field

40%
Trajnerowicz A., Golnik A., Kossacki P., Bardyszewski W., Wiater M., Karczewski G., Wojtowicz T.
Acta Physica Polonica A
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2009
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vol. 116
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issue 5
849-851
EN
Systematic studies of neutral heavy-hole excitonic line energy changes in a strong excitation regime were carried out by means of a pump-probe method for quantum wells containing a 2D gas of free holes. Energy shift of X_{e1hh1} line was analyzed for different excitation energies at fixed delay between pump and probe pulses, also under external magnetic field. It was observed that this shift depends not only on the density of created excitons but also directly on the pump energy. In co-polarization configuration for excitation energy below an absorption resonance the energetic blue shift rises linearly with the elevated exciton density (localized excitons are created). For energies slightly above the resonance, the blue shift diminishes dramatically in spite of high exciton density present (delocalized excitons are created). Model absorption calculations are in qualitative agreement with the experimental data.
6
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Inter-Dot Coupling in a Self-Assembled Quantum Dot System

40%
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.
7
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Long Decays of Excitonic Photoluminescence from CdTe/ZnTe Individual Quantum Dots

40%
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.
8
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Excitonic Giant Zeeman Effect in Wide Gap Diluted Magnetic Semiconductors Based on ZnO and GaN

40%
Pacuski W., Ferrand D., Kossacki P., Marcet S., Cibert J., Gaj J., Golnik A.
Acta Physica Polonica A
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2006
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vol. 110
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issue 3
303-309
EN
We present a theoretical description of the excitonic giant Zeeman effect observed in wide gap diluted magnetic semiconductors (Zn,Co)O and (Ga,Mn)N. In these materials, A and B excitons present quite complex energy shifts and change of oscillator strengths under magnetic field. These features can be well reproduced using an excitonic Hamiltonian, taking into account ion-carrier exchange, wurtzite trigonal crystal field, spin-orbit and electron-hole exchange interactions.
9
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MBE Growth and Magnetooptical Properties of (Zn,Co)Te Layers

40%
Papaj M., Kobak J., Rousset J., Janik E., Golnik A., Kossacki P., Pacuski W.
Acta Physica Polonica A
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2012
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vol. 122
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issue 6
1010-1011
EN
We report on epitaxial growth of diluted magnetic semiconductor (Zn,Co)Te. Reflectivity spectra reveal excitonic transition which split under magnetic field due to giant Zeeman effect. Magnetooptical effects can be described using literature data.
10
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Characterization of Self-Assembled CdTe/ZnTe Quantum Dots

40%
Kowalik K., Kudelski A., Golnik A., Gaj J., Karczewski G., Kossut J.
Acta Physica Polonica A
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2003
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vol. 103
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issue 6
539-544
EN
We present microluminescence investigations of self-assembled CdTe/ZnTe quantum dots. The dots proprieties resulting from our studies are: values of optical in-plane anisotropy parameters (electron - heavy hole exchange splitting and orientation of anisotropy) and value of effective Lande factor. Parameters giving information about in-plane anisotropy possess random distribution of values with the exchange splitting from 0 to 240 μeV. The effective Lande factor values for our dots are around g^*=-3.2 with a scatter of about 18%. Some PL lines exhibit sudden jumps of energetic position, related to variation of the charge state in their neighborhood.
11
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Numerical Rate Equation Approach to Picosecond Charge State Dynamics in CdTe/ZnTe Quantum Dots

40%
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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vol. 116
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issue 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.
12
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Anisotropic Exchange Interaction between p-Shell Electron and s-Shell Hole in CdTe/ZnTe Quantum Dots

40%
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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vol. 116
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issue 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.
13
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Control of Local Electric Fields Influencing the Photoluminescence οf an Individual CdTe/ZnTe Quantum Dot

40%
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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vol. 116
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issue 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.
14
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Magnetization Dynamics of a (Cd,Mn)Te Quantum Well in Pulsed Magnetic Field

40%
Kobak J., Goryca M., Kossacki P., Golnik A., Karczewski G., Wojtowicz T., Gaj J.
Acta Physica Polonica A
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2009
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vol. 116
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issue 5
907-908
EN
In this paper we present studies of magnetization relaxation in a (Cd,Mn)Te quantum well containing 3.2% of Mn, after a pulse of magnetic field. The relaxation was found to be very fast, with dominant component faster than 10 ns. Upon application of static magnetic field the relaxation does not slow down, in contrast with the behavior of very diluted quantum wells or bulk material.
15
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The Novel Multichannel Single Photon Correlations Technique Applied for the Spin Dynamics Study of a Few Mn^{2+} Ions in a CdTe/ZnTe Quantum Dot

40%
Malinowski F., Koperski M., Goryca M., Smoleński T., Golnik A., Kossacki P., Wojnar P.
Acta Physica Polonica A
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2013
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vol. 124
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issue 5
791-794
EN
In this work we demonstrate a novel experimental approach to the study of single photon correlations. The introduction of the multichannel detection setup enables the simultaneous measurement of a large number of correlation functions for photons emitted from different energetic ranges. The advantages of this new approach were exploited in a detailed study of the biexciton-exciton recombination cascade in CdTe/ZnTe quantum dots doped with a few Mn^{2+} ions. The information about the dynamics of the magnetic system in the quantum dot during the lifetime of the exciton was obtained from the analysis of the correlation functions.
16
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Type I CdSe and CdMgSe Quantum Wells

40%
Rudniewski R., Rousset J., Janik E., Kossacki P., Golnik A., Nawrocki M., Pacuski W.
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vol. 126
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issue 5
1167-1170
EN
In this work we present the band gap engineering, epitaxial growth and optical characterization of CdSe/Cd_{0.9}Mg_{0.1}Se and Cd_{0.9}Mg_{0.1}Se/Cd_{0.85}Mg_{0.15}Se quantum wells with a thickness ranging from 1 to 15 nm. These structures exhibit strong near-band-gap photoluminescence from helium up to room temperature. The emission energy is tuned in the range from 1.74 to 2.1 eV at 7 K, depending on the thickness and well composition. The most intense photoluminescence (both at 7 and 300 K) was observed for 10 nm thick CdSe/Cd_{0.9}Mg_{0.1}Se wells. Such a structure gives also a sharp emission line (FWHM = 20 meV) at low temperature. The presented quantum wells are well suited for being embedded in lattice matched ZnTe based microcavities.
17
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Excitonic Energy Shifts in CdMnTe/CdMgTe Quantum Wells under Resonant Excitation in Presence of 2D Carrier Gas

40%
Trajnerowicz A., Golnik A., Kossacki P., Bardyszewski W., Wiater M., Karczewski G., Wojtowicz T.
Acta Physica Polonica A
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2008
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vol. 114
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issue 5
1403-1409
EN
Systematic studies of amplitude and energy changes of excitonic lines in a strong excitation regime were carried out by a pump-probe method. The series of samples containing quantum wells with well width from 80 Åto 140 Åwas investigated. One 80 Åsample was n-doped with iodine, the rest of the quantum wells were intentionally undoped but contained a 2D gas of free holes. Its density could be varied by changing an intensity of additional illumination. The resonant creation of high population of e1hh1 excitons causes the energetic blue shift of the same due to interactions between excitons. The blue shifts did not depend on the concentration of 2D gas of carriers whereas it did depend on the power of excitation beam. Model calculations of absorption show qualitative agreement with the experimental data.
18
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Content available

Measurement of Very Small Zeeman Splittings in GaN:Mn,Mg by Faraday Rotation

33%
Wołoś A., Kossacki P., Golnik A., Kamińska M., Gaj J., Twardowski A., Grzegory I., Boćkowski M., Porowski S.
|
|
issue 4-5
695-699
EN
In this work we demonstrate an application of Faraday rotation for measuring an extremely small Zeeman splitting of an Mn related absorption line placed at 1.417 eV in optical absorption spectrum of Mn and Mg doped gallium nitride. Analysis of the collected spectra allowed us to determine the value of the splitting as equal to 0.12±0.01 meV at 6 T. This data should help in establishing the nature of the observed absorption band.
19
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Statistical Study of the Inter-Dot Excitation Transfer in CdTe/ZnTe Quantum Dots

33%
Koperski M., Kazimierczuk T., Goryca M., Golnik A., Gaj J., Nawrocki M., Wojnar P., Kossacki P.
Acta Physica Polonica A
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2011
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vol. 120
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issue 5
880-882
EN
In this work we present a statistical study of resonantly excited luminescence of coupled CdTe/ZnTe quantum dots studied by photoluminescence excitation measurements. We investigate the probability of resonance occurrence as a function of resonant energy. We come to the conclusion that the distribution of the inter-dot resonances is uniform, which suggests that the inter-dot excitation transfer is not limited by mean density of states in the emitting quantum dots.
20
Content available remote

Toward Better Light-Confinement in Micropillar Cavities

33%
Ściesiek M., Gietka K., Golnik A., Kossacki P., Jakubczyk T., Pacuski W., Kruse C., Hommel D.
Acta Physica Polonica A
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2011
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vol. 120
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issue 5
877-879
EN
We report on a two-step etching of ZnTe based micropillars. We demonstrate applicability of the technology and we analyze the optical properties of obtained structures. Microphotoluminescence spectra of individual micropillars show a typical mode pattern that confirms a successful growth of photonic structures. The reflectivity and photoluminescence spectra of a planar microcavity measured for various incident angles show that additional side distributed Bragg reflectors will be important for the further enhancement of photon confinement in micropillar cavity.
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