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Wyszukujesz frazę "Wójcik, A.J." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Trion Binding Energies and Wave Functions in Doped Quantum Wells
    Autorzy:
    Gładysiewicz, A.
    Wójcik, K.
    Wójs, A.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043713.pdf
    Data publikacji:
    2005-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Pq
    71.35.Ji
    Opis:
    The energy spectra of negative trions (X$\text{}^{-}$=2e+h) in one-sided doped GaAs quantum wells are calculated. The maps of the trion binding energyΔ as a function of well width w, electron concentration n, and the magnetic field B are obtained. The dependence of the trion ground state ("bright singlet" versus "dark triplet") on those parameters is established.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 4; 669-674
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Development in Multilayer $TiB_x // TiSi_y C_z$ Coatings during Post-Deposition Heat Treatment
    Autorzy:
    Twardowska, A.
    Rajchel, B.
    Morgiel, J.
    Mędala-Wójcik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398372.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    81.20.-n
    42.62.-b
    61.43.Dq
    68.37.-d
    68.37.Lp
    68.65.Ac
    64.70.Kb
    Opis:
    Multilayer amorphous $TiB_{x} // TiSi_{y}C_{z}$ coatings were formed by duplex treatment: dual beam ion beam assisted deposition and pulsed laser deposition. Post-deposition heating was applied to activate crystallization in the coating. In situ transmission electron microscopy heating experiments were conducted in the temperature range 20-600°C. Crystallization of TiB₂ phase in $TiB_{x}$ layers begun at 450°C, while $TiSi_{y}C_{z}$ layers retained nearly amorphous up to 600°C.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1124-1126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Angular and Temperature Tuning of Emission from Vertical-External-Cavity Surface-Emitting Lasers (VECSELs)
    Autorzy:
    Wójcik-Jedlińska, A.
    Muszalski, J.
    Bugajski, M.
    Łukowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812025.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    85.35.Be
    78.67.De
    42.55.Sa
    42.55.Xi
    Opis:
    In this paper we demonstrate how the tuning of the VECSEL heterostructure can be precisely determined. Since the VECSEL active region is embodied in a microcavity, the photoluminescence signal collected from the chip surface is modified by the resonance of this cavity. The angle resolved photoluminescence measurements combined with the temperature tuning of the structure allowed us to precisely determine VECSEL emission features. The investigated structure consists of GaAs cavity with six InGaAs quantum wells and is designed for lasing at 980 nm.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1437-1443
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Anisotropy of UFe$\text{}_{10-x}$Ni$\text{}_{x}$Si$\text{}_{2}$ Intermetallic Alloys
    Autorzy:
    Drzazga, Z.
    Suski, W.
    Wochowski, K.
    Wójcik, J.
    Winiarska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014420.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.20.En
    61.10.Nz
    Opis:
    The magnetic anisotropy in UF$\text{}_{10-x}$Ni$\text{}_{x}$Si$\text{}_{2}$ series has been studied by torsion magnetometry and initial ac magnetic susceptibility measurements in the temperature range of 77-293K. The effective anisotropy constant changes with Ni content showing some increase for intermediate concentration. An increase in magnetic anisotropy energy at low temperatures is due to the uranium sublattice ordering. Magnetic anisotropy behaviour in UFe$\text{}_{2}$Ni$\text{}_{8}$Si$\text{}_{2}$ is influenced by an additional enhancement of the 3d sublattice connected with the ordering Fe magnetic moments.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 555-559
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monotropic Character of Polymorphism in Pentachloropyridine Crystal Studied by Calorimetric and Spectroscopic Methods
    Autorzy:
    Wójcik, G.
    Giermańsκa-Kahn, J.
    Marqueton, Y.
    Foulon, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933583.pdf
    Data publikacji:
    1995-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    78.30.-j
    Opis:
    Pentachloropyridine crystals in two polymorphic modifications: tetragonal and monoclinic were studied by differential scanning calorimetry and polarized IR and Raman spectroscopy in 20 to 200 cm$\text{}^{-1}$ region and at different temperatures from melting point down to the liquid nitrogen temperature. The 4 K difference in melting points of both forms indicates the occurrence of monotropy. The spectra were discussed in terms of positional disorder in the studied crystals which often happen to be mixtures of the monoclinic crystal and the L- and D-forms of the tetragonal one. The monotropic transition of the metastable tetragonal crystal into the stable monoclinic one was observed in the Raman spectra and under the polarizing microscope at temperatures ranging from 170 to 185 K and as an anomaly on the differential scanning calorymetry diagram at 193 K.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 2; 339-347
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Non-Square InGaAsP/InP Quantum Wells in the Electric Field by Photoreflectance
    Autorzy:
    Kudrawiec, R.
    Sęk, G.
    Rudno-Rudziński, W.
    Misiewicz, J.
    Wojcik, J.
    Robinson, B. J.
    Thompson, D. A.
    Mascher, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035600.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Hs
    78.67.-n
    66.10.Cb
    Opis:
    Non-square quantum wells in electric field have been investigated by photoreflectance and photoluminescence spectroscopies. The structures have been obtained by a post-growth modification (rapid thermal annealing) of standard 1.55μm InGaAsP-based laser structures that were grown by gas source molecular beam epitaxy. During rapid thermal annealing a migration of semiconductor atoms across quantum well interfaces changes the quantum well profile from a square well to a rounded well. The modification of the profile changes energy levels in the quantum well and in consequence a blue shift of the quantum well emission peak is observed in photoluminescence. In this paper the blue shift of the ground state transition of post-growth modified quantum well structures has been investigated by both photoluminescence and photoreflectance techniques. Also a blue shift of excited state transitions has been observed in photoreflectance spectra. Generally, a stronger blue shift for the ground state transition than for excited state transitions has been observed. Additionally, oscillator strengths for all quantum well transitions have been determined from photoreflectance spectra. It has been found that the oscillator strength is constant for all quantum well transitions despite of modification of the quantum well profile.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 649-657
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monocrystalline and Polycrystalline ZnO and ZnMnO Films Grown by Atomic Layer Epitaxy - Growth and Characterization
    Autorzy:
    Wójcik, A.
    Kopalko, K.
    Godlewski, M.
    Łusakowska, E.
    Paszkowicz, W.
    Dybko, K.
    Domagała, J.
    Szczerbakow, A.
    Kamińska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038164.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    Recently we demonstrated growth of monocrystalline ZnO films by atomic layer epitaxy in the gas flow variant using inorganic precursors. In this study, we discuss properties of ZnO films grown with organic precursors. Successful Mn doping of the ZnO films during the growth was achieved using the Mn-thd complex. Secondary ion mass spectroscopy and X-ray investigations reveal the contents of Mn up to about 20% of the cationic component.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 667-673
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Photoluminescence Study in PbS-EuS Superlattices
    Autorzy:
    Kowalczyk, L.
    Sadowski, J.
    Gałązka, R. R.
    Stachow-Wójcik, A.
    Sipatov, A. Yu.
    Volobuev, V. V.
    Smirnov, V. A.
    Dugaev, V. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991612.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    Opis:
    Investigations of the photoluminescence of PbS-EuS superlattices deposited on (111)BaF$\text{}_{2}$ substrates are presented. Quantum-size and deformation effects in photoluminescence spectra are observed. The strain-induced gap shift and valence-band offset is determined from experimental results. A strong stimulated photoluminescence with relatively low threshold was observed. It was found that the photocarriers generated in EuS barrier strongly affect the population of PbS subbands.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 397-400
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Anisotropy in Eus-pbs Multilayers
    Autorzy:
    Story, T.
    Swüste, C. H. W.
    Swagten, H. J. M.
    de Jonge, W. J. M.
    Stachow-Wójcik, A.
    Twardowski, A.
    Arciszewska, M.
    Dobrowolski, W.
    Gałązka, R. R.
    Sipatov, A. Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013042.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.70.Ak
    Opis:
    We present the results of ferromagnetic resonance studies of the thickness dependence of magnetic anisotropy in 2 series of EuS-PbS multilayers grown on (111) BaF$\text{}_{2}$ and (100) KCl substrates with the EuS thickness varying in the range d=6-70 Å. The anisotropy constant K was found to follow the dependence K(d)=K$\text{}_{V}$+2K$\text{}_{S}$/d , with the surface term K$\text{}_{S}$ larger for layers grown on BaF$\text{}_{2}$ as compared to KCl. This difference is discussed in terms of different thermal stress-induced distortions of cubic crystal lattice of EuS. We found that the thickness of EuS layer required for the perpendicular (to the layer) magnetization is d ≤ 2-3 Å, i.e., it is below 1 monolayer.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 435-438
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do We Understand Magnetic Properties of ZnMnO?
    Autorzy:
    Godlewski, M.
    Wójcik, A.
    Kopalko, K.
    Ivanov, V. Yu.
    Wilamowski, Z.
    Jakieła, R.
    Guziewicz, E.
    Szczepanik, A.
    Dłużewski, P.
    Chikoidze, E.
    Barjon, J.
    Dumont, Y.
    Putkonen, M.
    Niinistö, L.
    Tang, Dong
    Powiązania:
    https://bibliotekanauki.pl/articles/2047644.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    75.75.+a
    78.30.Fs
    78.60.Hk
    Opis:
    Optical and magnetic properties of ZnMnO films are discussed based on the results of cathodoluminescence, photoluminescence, and magneto-photoluminescence investigations. We show that photoluminescence/cathodoluminescence emissions are strongly quenched and become in-plane inhomogeneous in samples with increased Mn fractions. Strong polarization of photoluminescence is observed, even though excitonic lines do not shift and are not split at magnetic fields up to 6 T.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 261-267
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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