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Wyszukujesz frazę "Semenov, Yu." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Interface Effects in the Model of δ-Potential for 2D Semiconductor Quantum Structures
    Autorzy:
    Semenov, Yu. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992189.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    78.66.-w
    Opis:
    Here we show that the enhancement of exchange field at the nonmagnetic- semimagnetic semiconductor interface can be described by δ-localized exchange field. In this model, the wave functions of electron confined in quantum well with semimagnetic barriers can be found analytically for an arbitrary orientation of magnetic field B with respect to growth axis C. Two cases corresponding to B∥C and B⊥C are considered. The comparison of present approach with experimental data shows that the proposed method is an efficient tool for interface investigation in 2D quantum structures.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 526-530
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Photoluminescence Polarization in Semiconductor Quantum Well Subjected to In-Plane Magnetic Field
    Autorzy:
    Semenov, Yu. G.
    Ryabchenko, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038089.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.-n
    78.20.Ls
    Opis:
    Strong optical polarization anisotropy observed previously in the exciton photoluminescence from [100]-oriented quantum wells subjected to the in-plane magnetic field is described within microscopic approach. Developed theory involves two sources of optical polarization anisotropy. The first of them is due to correlation between ψ-functions phases of electron and heavy hole which arise owing to electron Zeeman spin splitting and joint manifestation of low-symmetrical and Zeeman interactions of heavy holes in an in-plane magnetic field. Other optical polarization anisotropy source stems from the admixture of light-holes states to heavy-holes ones by low-symmetry interactions. The heavy hole splitting caused by these interactions separately and the effects of their interference are analyzed. The domination of C$\text{}_{2v}$ low-symmetry interaction connected with quantum wells interfaces and/or in-plane deformations takes place in relatively low magnetic field. The directions of this perturbation determine main directions of the π-periodical optical polarization anisotropy. The cubic anisotropy of valence band can add the π/2-periodical contribution to the optical polarization anisotropy. In the case of quantum wells with semimagnetic barriers the Zeeman term contribution can reach value, which dominates the C$\text{}_{2v}$ ones, and crossover to polarization connected with magnetic field direction may be observed in low temperature.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 537-545
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Magnetic Field on Blue Anti-Stokes Luminescence of ZnSe:Cr Crystals
    Autorzy:
    Ivanov, V. Yu.
    Semenov, Yu.G.
    Surma, M.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1950807.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    78.55.Et
    76.30.Fc
    Opis:
    The results of photoluminescence and magneto-luminescence studies of chromium doped ZnSe crystals are presented for blue colour shallow donor-shallow acceptor pair photoluminescence, with a zero phonon line at 2.692 eV. This donor-acceptor pair photoluminescence is observed under photo-excitation with photon energies smaller than the emission energy (anti-Stokes luminescence) and dominates in the photoluminescence spectrum of ZnSe:Cr at the excitation energy about 2.41 eV and for temperature T<20 K. A quantum efficiency of this anti-Stokes luminescence is relatively large. It is of about 10$\text{}^{-3}$ at 0 T and increases with increasing magnetic field up to 7 T at temperature T=2 K. We relate the intensity of the anti-Stokes luminescence to a non-equilibrium concentration of photo-excited Cr$\text{}^{+}$ ions and propose that the rate of spin-dependent recombination of Cr$\text{}^{+}$ ions with free holes (decreases with increasing magnetic field) is responsible for the observed increase in the anti-Stokes luminescence intensity at higher magnetic fields.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 821-824
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nature of Blue Anti-Stokes Luminescence in ZnSe:Cr
    Autorzy:
    Ivanov, V. Yu.
    Semenov, Yu. G.
    Surma, M.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933759.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.Fc
    71.55.Gs
    78.55.Et
    Opis:
    The mechanism of the anti-Stokes photoluminescence in ZnSe:Cr is discussed. It is shown that the two-step ionization transitions of Cr(2$\text{}^{+}$ ↔ 1$\text{}^{+}$) result in appearance of the blue anti-Stokes photoluminescence of ZnSe:Cr. There are also some indications that the Auger type co-operative process can contribute to the photoluminescence excitation.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 743-746
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diluted Magnetic Semiconductor Investigations in Ukraine. Nature of Some Additional Lines in QW Optical Spectra
    Autorzy:
    Ryabchenko, S. M.
    Abramishvili, V. G.
    Komarov, A. V.
    Semenov, Yu. G.
    Kyrychenko, F. V.
    Dubowski, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968990.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    Opis:
    The general review of the history and present-day situation of diluted magnetic semiconductor investigation in Ukraine is given by S. Ryabchenko. Some noteworthy results of diluted magnetic semiconductor investigation obtained in Ukraine are pointed out. The main features of the present day situation are mentioned also. As an example of last diluted magnetic semiconductor investigations, the new result obtained by Abramishvili, Komarov, Ryabchenko, Semenov, Kyrychenko and Dubowski for Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te/CdTe/Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te quantum well structures grown by laser ablation method are presented. A weak additional line was observed in the reflectivity spectra of a 27 Å wide quantum well with x= 0.11 in the barrier. Such additional line has not been observed in spectra of similar molecular beam epitaxy grown structures. Based on the theoretical computations of the energies and the relation of intensities of the main and additional lines we conclude that this line might be associated with hh2 → e1 transitions, which ceases to be forbidden in the presence of technologically caused asymmetry of quantum well potential profile.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 165-176
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Потенциал влаги в условиях фазового перехода почвенного раствора в дерново-подзолистой почве
    The moisture potential in conditions of phase transition of soil solution in sod-podzolic soil
    Autorzy:
    Muromcev, N. A.
    Anisimov, A. B.
    Mazhayskiy, Yu. A.
    Semenov, N. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2065506.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    atmospheric precipitation
    total evaporation
    moisture potential
    soil temperature
    moisture exchange
    aeration zone
    lowest moisture capacity
    diffusion of moisture
    Opis:
    Установлено новое явление резкого скачкообразного повышения потенциала влаги при переходе положительных значений температуры почв через ноль в область отрицательных величин. Процесс протекает в условиях фазового перехода почвенного раствора при стабильном состоянии всех других параметров среды, за исключением температуры почвы. Понижение потенциала влаги (при постоянной влажности) в условиях повышения температуры объясняется возрастанием подвижности и активности ионов влаги. Понижение температуры обусловливает возрастание потенциала в связи с понижением активности и подвижности ионов воды. Данное явление аналогично снижению содержания влаги в почве. Суточные изменения температуры почвы и потенциала почвенной влаги незначительны и лежат в пределах 0,1÷1,9°С и 2÷3 кПа соответственно.
    A new phenomenon of a sharp jump - like increase of the moisture potential is established in the transition of positive soil temperature values through zero to the region of negative values. The process proceeds under conditions of a phase transition of the soil solution with the stable state of all other soil parameters. The decrease of the moisture potential (at constant humidity) under conditions of temperature increase is explained by the increase in mobility and activity of moisture ions. The decrease in temperature causes an increase in the potential due to a decrease in the activity and mobility of water ions. This phenomenon is similar to reducing the moisture content in soil. Daily changes in soil temperature and soil moisture potential are insignificant and is in the range 0.1÷1.9°C and 2÷3 kPa respectively.
    Źródło:
    Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2018, 7, 1; 57--66
    2299-8535
    2544-963X
    Pojawia się w:
    Budownictwo o Zoptymalizowanym Potencjale Energetycznym
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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