Temat: 76.70.Hb - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Optical Detection of Paramagnetic Centres in Activated Oxyfluoride Glass-Ceramics
Autorzy:: Rogulis, U.
Fedotovs, A.
Antuzevics, A.
Berzins, Dz.
Zhydachevskyy, Ya.
Sugak, D.
Tematy:: 76.70.Hb
76.30.-v; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1029682.pdf Link otwiera się w nowym oknie
Opis:: Electron paramagnetic resonance (EPR), magnetic circular dichroism (MCD) and EPR detected via MCD (MCD-EPR) investigations have been performed on rare-earth activated oxyfluoride glasses and glass-ceramics. Er³⁺, Gd³⁺, and Mn²⁺ activators in oxyfluoride glass-ceramics show paramagnetic MCD behaviour and the MCD-EPR has been detected. The results of the MCD-EPR measurements for the Er-doped oxyfluoride glass-ceramics showed that Er³⁺ ions in the CaF₂ crystallites in these ceramics embed only in the cubic symmetry environment, similarly to the previous observations of cubic Gd³⁺ centres in the glass-ceramics containing CaF₂. Finally, the correlation of optics and paramagnetic centres is discussed for Mn-doped YAlO₃ ceramics.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 2.

Tytuł:: Study of DI-Hydrogen-Monovacancy Defect in Silicon
Autorzy:: Stallinga, P.
Nielsen, B. B.
Tematy:: 76.30.Lh
76.70.Hb
76.30.-v; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1968423.pdf Link otwiera się w nowym oknie
Opis:: A careful analysis of the alleged electron paramagnetic resonance spectrum of VH$\text{}_{2}$ in silicon is made. The parameters of this spectrum coincide with those of the well-known excited state (S=1) spectrum of the oxygen vacancy defect. The conclusion is reached that they are one and the same.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 3.

Tytuł:: Enhanced Exciton-Phonon Interaction in Strained ZnCdSe/ZnSe Quantum Well Structures
Autorzy:: Godlewski, M.
Leonardi, K.
Hommel, D.
Tematy:: 68.60.-p
76.70.Hb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1968093.pdf Link otwiera się w nowym oknie
Opis:: Radiative recombination processes in pseudomorphic ZnCdSe/ZnSe structures are compared to those observed in strain-relaxed structures grown on GaAs substrates with thick ZnSe buffer layers. From the temperature dependence of the photoluminescence line width we evaluate the strength of exciton-phonon interaction with acoustic (dominant at lower temperatures) and optical phonons. Stronger exciton-phonon interaction is observed for pseudomorphic structures. Such enhanced exciton-phonon interaction is likely responsible for a faster photoluminescence deactivation at increased temperatures. We also report different exciton properties (photoluminescence intensity, width, strength of exciton-phonon interaction) in quantum well of a given width but in structures grown with different order of quantum wells. More stable photoluminescence (with increasing temperature) is observed for a given quantum well if it is closer to the buffer layer and not to the cap layer.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Nonradiative Recombination Processes in (CdTe,CdCrTe)/CdMgTe Quantum Well Structures
Autorzy:: Godlewski, M.
Ivanov, V.
Zakrzewski, A. J.
Wojtowicz, T.
Karczewski, G.
Kossut, J.
Bergman, J. P.
Monemar, B.
Tematy:: 68.60.-p
76.70.Hb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1968108.pdf Link otwiera się w nowym oknie
Opis:: Photoluminescence transitions in (CdTe,CdCrTe)/CdMgTe structure grown by molecular beam epitaxy are studied. Photoluminescence investigations show a very strong reduction of the photoluminescence intensity from chromium doped quantum wells. We explain this fact by a very efficient nonradiative recombination in the chromium-doped quantum wells. The present results indicate that the Auger-type energy transfer from excitons to chromium ions is responsible for the photoluminescence deactivation. The efficiency of this process is evaluated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Neutron Transmutation Doped GaP: Optically Detected Magnetic Resonance Studies
Autorzy:: Heijmink Liesert, B.
Godlewski, M.
Gregorkiewicz, T.
Ammerlaan, C. A. J.
Goldys, E.
Tematy:: 61.80.Hg
76.70.Hb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1887198.pdf Link otwiera się w nowym oknie
Opis:: The first direct proof for successful neutron transmutation doping (NTD) of GaP is presented on the basis of optically detected magnetic resonance (ODMR). GaP:S samples grown by the liquid encapsulated Czochralski method were irradiated with thermal neutrons and subsequently annealed at 800°C. In the ODMR experiments the transmuted Ge substitutional on Ga sites was detected. The NTD process was also found to create deep acceptors, the nature of which will be tentatively discussed.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Time-Resolved Microwave Spectroscopy of High Electron Mobility GaAs/AlGaAs Structures
Autorzy:: Khachepuridze, A.
Ivanov, V. Yu.
Godlewski, M.
Regiński, K.
Bugajski, M.
Tematy:: 73.20.Dx
76.40.+b
76.70.Hb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1991552.pdf Link otwiera się w nowym oknie
Opis:: Mechanism of the optical detection of cyclotron resonance via emission from 2D electron gas in modulation doped quantum wells and in high electron mobility structures of GaAs/AlGaAs is discussed based on the results of time-resolved optical detection of cyclotron resonance. An important role of impact ionization processes is demonstrated. We also show that microwave radiation destroys emission enhancement at the Fermi level and the relevant mechanism is proposed.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: Influence of Growth Conditions on Optical Properties of ZnCdSe/ZnSe Quantum Wells Grown by Molecular Beam Epitaxy
Autorzy:: Godlewski, M.
Bergman, J. P.
Monemar, B.
Kurtz, E.
Hommel, D.
Tematy:: 68.60.-p
71.35.+z
76.70.Hb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1950749.pdf Link otwiera się w nowym oknie
Opis:: The results of investigations of photoluminescence, time-resolved photoluminescence, photoluminescence kinetics and their temperature dependencies are discussed for two types of ZnCdSe/ZnSe multi quantum well structures - for pseudomorphic and for strain relaxed structure. Densities of 2D localized states and averaged localization energies, as seen by excitons, are determined from the photoluminescence kinetics measurements. We show distinct differences between exciton properties in two multi quantum well structures studied.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 8.

Tytuł:: Optically Detected Magnetic Resonance Studies of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x=0.095, 0.007)
Autorzy:: Godlewski, M.
Świątek, K.
Gałązka, R. R.
Monemar, B.
van Loosdrecht, P. H. M.
Wittlin, A.
Perenboom, J. A. A. J.
Tematy:: 76.70.Hb
78.55.Et
71.35.+z; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1929637.pdf Link otwiera się w nowym oknie
Opis:: The dominant mechanism responsible for the optical detection of the Mn$\text{}^{2+}$ magnetic resonance in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.095, 0.007) is explained. By either change of the external magnetic field or by setting the conditions for the Mn$\text{}^{2+}$ magnetic resonance, we could change the relative efficiencies of the two competing excitonic recombination processes. By lowering magnetization at the magnetic resonance, recombination via the acceptor bound exciton channel, which is mainly nonradiative, is enhanced. Then, a large up to 50% decrease in the total photoluminescence efficiency was observed in the optically detected magnetic resonance experiment. Such observation allows for verification of the large efficiency of the Auger-type transition responsible for the nonradiative decay of the acceptor bound exciton.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Weak Ferromagnetism of Fe Intercalated Fullerides
Autorzy:: Byszewski, P.
Diduszko, R.
Baran, M.
Tematy:: 78.20.Ls
76.70.Hb
78.55.Kz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1929859.pdf Link otwiera się w nowym oknie
Opis:: The magnetic properties of C$\text{}_{60}$Fe$\text{}_{x}$ resemble spin glass with the freezing onset above 200 K. The unusual magnetization behavior at intermediate temperatures is ascribed to bonds reorganization.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: Free Carriers Heating at Mn$\text{}^{2+}$ Magnetic Resonance in CdMnTe
Autorzy:: Godlewski, M.
Gałązka, R. R.
Tsimperidis, I.
Gregorkiewicz, T.
Ammerlaan, C. A. J.
Tematy:: 78.55.Et
76.70.Hb
75.30.Hx; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1931938.pdf Link otwiera się w nowym oknie
Opis:: The results of optically detected magnetic and cyclotron resonance experiments performed on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.007) are presented. It is shown that the Mn$\text{}^{2+}$ magnetic resonance results in heating of free holes, which can be observed via the effects of hot holes on the CdMnTe "edge" emission.
Dostawca treści:: Biblioteka Nauki

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