Temat: JI - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Observation of Vacancies in Ga$\text{}_{1-x}$Mn$\text{}_{x}$As with Positron Annihilation Spectroscopy
Autorzy:: Tuomisto, F.
Slotte, J.
Saarinen, K.
Sadowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/2036028.pdf
Data publikacji:: 2003-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.72.Ji
75.50.Pp
78.70.Bj
Opis:: Positron annihilation spectroscopy can be used to determine the role of vacancy defects in semiconductors, by identification and quantification of the vacancies and their chemical surroundings. We have studied 0.5-0.8μm thick low temperature MBE GaMnAs layers with Mn content 0.5--5% and different As$\text{}_{2}$ partial pressures at growth. The Doppler broadening results show that the Ga vacancy concentration in the layers decreases with increasing Mn content and decreasing As$\text{}_{2}$ partial pressure.
Źródło:: Acta Physica Polonica A; 2003, 103, 6; 601-606
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Time-Resolved Studies of Gallium Nitride Doped with Gadolinium
Autorzy:: Witek, B.
Wysmołek, A.
Kamińska, M.
Twardowski, A.
Potemski, M.
Boćkowski, M.
Grzegory, I.
Powiązania:: https://bibliotekanauki.pl/articles/1812021.pdf
Data publikacji:: 2008-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.55.Cr
75.50.Pp
71.55.-i
71.35.Ji
Opis:: Time-resolved photoluminescence experiments on high quality bulk GaN doped with Gd are presented. It was found that the decay time of Gd-related transitions observed for 4.2 K around 1.78 eV is of about 3 ms. Such a long decay time strongly supports the identification of this emission band as due to transitions between Gd³+(4f⁷) levels. The decay time measured for Gd-related transitions observed in the UV spectral range, close to the GaN band-gap, was found to be much faster than 1 μs. This suggests that these emission lines could hardly be correlated with internal transitions within Gd³+(4f⁷). Possible origin of the Gd-related UV luminescence is discussed.
Źródło:: Acta Physica Polonica A; 2008, 114, 5; 1425-1430
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: MBE Growth and Magnetooptical Properties of (Zn,Co)Te Layers
Autorzy:: Papaj, M.
Kobak, J.
Rousset, J.
Janik, E.
Golnik, A.
Kossacki, P.
Pacuski, W.
Powiązania:: https://bibliotekanauki.pl/articles/1403629.pdf
Data publikacji:: 2012-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
75.30.Hx
78.20.Ls
71.35.Ji
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2012, 122, 6; 1010-1011
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Magnetooptical Properties of (Ga,Fe)N Layers
Autorzy:: 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.
Powiązania:: https://bibliotekanauki.pl/articles/1492954.pdf
Data publikacji:: 2011-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
75.30.Hx
78.20.Ls
71.35.Ji
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2011, 120, 5; 921-923
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Excitonic Giant Zeeman Effect in Wide Gap Diluted Magnetic Semiconductors Based on ZnO and GaN
Autorzy:: Pacuski, W.
Ferrand, D.
Kossacki, P.
Marcet, S.
Cibert, J.
Gaj, J. A.
Golnik, A.
Powiązania:: https://bibliotekanauki.pl/articles/2046983.pdf
Data publikacji:: 2006-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
75.30.Hx
78.20.Ls
71.35.Ji
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2006, 110, 3; 303-309
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Magnetic Ions in Studies of Semiconductor Quantum Well Structures
Autorzy:: Kossacki, P.
Powiązania:: https://bibliotekanauki.pl/articles/1968988.pdf
Data publikacji:: 1998-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
78.30.Fs
78.66.Hf
71.35.Cc
71.35.Ji
Opis:: A few aspects of a relation between magnetic properties of Mn ion system and electronic states confined in CdTe based quantum wells are discussed. It is shown that the influence of the magnetic fluctuations on the states confined in the quantum well results in the reduction of the relative valence band offset with temperature. Also the decrease in the effective Zeeman splitting is observed by a modulation technique at high temperatures and is explained in terms of the modification of the selection rules for an exciton localised in thermal fluctuations. For the p-doped samples the giant Zeeman splitting is used to tune the polarization of a hole gas by a small magnetic field. The "competition-like" relation between the oscillator strength of exciton (X) and positive trion (X$\text{}^{+}$) is proved experimentally.
Źródło:: Acta Physica Polonica A; 1998, 94, 2; 147-154
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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