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    Wyświetlanie 1-5 z 5
    Tytuł:
    Magnetophotoconductivity Due to Intra-Shallow-Donor Transitions in Semi-Insulating GaAs
    Autorzy:
    Karpierz, K.
    Sadowski, M. L.
    Grynberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890653.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    78.20.Ls
    78.50.-w
    Opis:
    The paper concerns investigations of shallow centres in semi-insulating (SI) GaAs samples. A very sensitive measuring method - magnetophotoconductivity due to intra-shallow-donor transitions - was used. We report the behaviour of intra-impurity transitions as well as an additional structure in low magnetic fields for different far-infrared wavelengths (70.6 μm, 96.5 μm, 118.8 μm, 163 µm). The results are discussed in terms of a fluctuating potential from ionized centres in SI GaAs. The physical mechanism responsible for the low magnetic field structure is proposed.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 291-294
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intra-Shallow-Donor Photoconductivity in Semi-Insulating GaAs
    Autorzy:
    Karpierz, K.
    Sadowski, M. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1877562.pdf
    Data publikacji:
    1991-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    78.20.ls
    78.50.Ec
    78.50.Ge
    Opis:
    The far-infrared photoconductivity of a semi-insulating GaAs sample was measured at 4.2 K as a function of magnetic field up to 7 T. Apart from a peak corresponding to the 1s - 2p$\text{}_{+1}$ transition of the hydrogen-like shallow donor, a well-pronounced structure was observed which does not appear in n-type GaAs.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 1; 121-124
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence and Photoconductivity of Cerium Compounds
    Autorzy:
    Yen, W. M
    Basun, S.
    Happek, U.
    Raukas, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945563.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    78.50.Ec
    78.55.Hx
    Opis:
    The study of the luminescence properties of rare earth doped systems historically focuses on systems which exhibit strong luminescence. More recently, extensive studies on materials with high quantum efficiency are in part motivated by the search for new phosphor and scintillator materials. However, a thorough study of certain systems which show very low quantum yield will certainly lead to a better understanding of phosphor materials and rare earth systems in general. As an example of recent studies which address both the fundamental question of relaxation processes in rare earth doped systems and phosphor applications we present studies on cerium-doped lutetium oxide crystals which are characterized by a complete quenching of the 5d-4f luminescence and compare its optical properties to that of very efficient cerium doped phosphor material, lutetium oxyorthosilicate. To find the mechanisms which lead to the different quantum efficiency in these systems, extensive absorption, photoexcitation and photoconductivity studies were performed on single crystals. We demonstrate that the radically different emission properties of the investigated systems originate in small but crucial differences in the location of the emitting 5d level of the cerium ion with respect to the conduction band of the host - a general result which can be applied to a broad range of materials.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 257-266
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetotransmission Measurements of Intra-Shallow-Donor Transitions in Semi-Insulating GaAs
    Autorzy:
    Karpierz, K.
    Kożuchowski, K.
    Grynberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920976.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    78.20.Ls
    78.50.Ge
    Opis:
    In this paper we present the results of an investigation of the 1s-2p$\text{}_{+}$ intra-shallow-donor transition by means of an extremely difficult magnetotransmission experiment performed on semi-insulating GaAs. We report the temperature dependence of the transition intensity. We noticed the absence in the absorbance spectra of a well-pronounced structure which is observed at low magnetic fields in photoconductivity measurements. The results are discussed in terms of a fluctuating potential from ionized centres in semi-insulating GaAs.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 617-619
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoinduced Phenomena in Sulphur Crystals and Films
    Autorzy:
    Dovgii, Ya. O.
    Kityk, I. V.
    Yablonovska, O. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920534.pdf
    Data publikacji:
    1992-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.40.+w
    71.55.Gs
    78.50.Ge
    Opis:
    The irradiation of sulphur crystals and films with ultraviolet light induces the change of transmission in the visible part of spectra. It was found that these phenomena exist only at low temperatures (4.2-50 K). The behaviour of optical transparency as a function of time after switching the rumination off was investigated. These dependences are essentially different for the films and crystals. In order to understand the origin of these phenomena the structural investigation was conducted. Very unusual behaviour of darkening kinetics was obtained.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 3; 405-408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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