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    Wyświetlanie 1-11 z 11
    Tytuł:
    Near-Band-Edge Photoluminescence from Very High Quality Hexagonal ZnO Bulk Crystals
    Autorzy:
    Lieu, N. T. T.
    Dat, D. H.
    Liem, N. Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035657.pdf
    Data publikacji:
    2003-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.-y
    78.55.-m
    78.55.Et
    Opis:
    The near-band-edge photoluminescence spectra of very high quality hexagonal ZnO single crystals in the temperature range between 9 and 305 K were measured. Based on the energetic positions and the evolutions of well-resolved photoluminescence lines with temperature and with excitation power density we interpret the observed photoluminescence lines as resulting from recombination of the free-exciton, bound-exciton, biexciton, inelastic exciton-exciton collision and electron-hole plasma.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 1; 67-75
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation Time of Magnetic Polarons
    Autorzy:
    Dietl, T.
    Peyla, P.
    Grieshaber, W.
    Merle d'Aubigné, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1872800.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    78.55.Et
    75.50.Rr
    Opis:
    It is shown that non-scalar spin-spin interactions rather than spin-lattice coupling or spin diffusion control the dynamics of the magnetization formation visible in time-resolved luminescence and SQUID magnetometry.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 361-364
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CdSe/ZnS Colloidal Quantum Dots with Alloyed Core/Shell Interfaces: A Photoluminescence Dynamics Study
    Autorzy:
    Dziatkowski, K.
    Ratchford, D.
    Hartsfield, T.
    Li, X.
    Gao, Y.
    Tang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492859.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.47.jd
    78.55.Et
    Opis:
    Time-resolved photon counting technique was employed to study dynamics of photoluminescence from the ensemble and single CdSe/ZnS quantum dots with the alloyed core/shell interfaces. The ensemble data revealed enhanced effect of disorder-induced trap states for increasing emission energy, as implied from the changes in the distribution of total decay rates. The emission trajectories collected for single quantum dots showed familiar, two-state blinking pattern. It suggests that in a large-band-offset CdSe/ZnS system, the introduced alloying of the core-to-shell region cannot smooth enough the confinement potential in order to suppress nonradiative Auger recombination and blinking.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 870-873
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Exciton and Trion States in CdTe Quantum Well at High Magnetic Fields
    Autorzy:
    Andronikov, D.
    Platonov, A.
    Crooker, S.
    Barrick, T.
    Karczewski, G.
    Kochereshko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043711.pdf
    Data publikacji:
    2005-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    73.21.Fg
    78.55.Et
    78.67.De
    Opis:
    Temperature dependent photoluminescence and reflectivity spectra of excitons, singlet and triplet states of trions were studied in CdTe-based quantum wells at high magnetic fields. Interesting features of the exciton and trion spectral lines with altering temperatures are explained by analyzing the thermal population and the kinetics of the exciton-electron-trion energetic system.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 4; 653-660
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Magnetic Polaron Features in Photoluminescence Excitation Spectra of CdTe/(CdMn)Te Quantum Wells with High Mn Contents
    Autorzy:
    Mackh, G.
    Ossau, W.
    Yakovlev, D. R.
    Landwehr, G.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933923.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.+z
    78.55.Et
    Opis:
    Exciton magnetic polarons are studied in CdTe/Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (0.4 ≤ x ≤ 0.8) quantum wells. The magnetic polaron formation leads to the appearance of an additional line in the photoluminescence excitation spectra, which can be employed to determine the Zeeman splittings more exactly than by using the free exciton peak. We find an overall increase in the polaron energy with increasing x in the whole range of Mn contents studied.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 849-852
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excitons and Trions in Modulation Doped Structures in High Magnetic Fields
    Autorzy:
    Kochereshko, V.
    Andronikov, D.
    Platonov, A.
    Crooker, S.
    Barrick, T.
    Karczewski, G.
    Tronc, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038321.pdf
    Data publikacji:
    2004-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    71.35.-y
    78.20.Ls
    78.40.Fy
    Opis:
    Photoluminescence spectra of modulation-doped CdTe/CdMgTe quantum well structures containing two-dimensional electron gases of low, moderate and high electron concentrations were studied in high magnetic fields up to 45 T. The recombination line of triplet trion state was found in the spectra. A model calculation of photoluminescence spectra in magnetic fields, which takes into account singlet and triplet trion states, was carried out. It was shown that the dark triplet becomes observable in photoluminescence spectra because it becomes the only recombination channel when the formation of the singlet trion state is suppressed by magnetic fields.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 3; 319-328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave-Induced Delocalization of Excitons in Ternary Compounds of II-VI and III-V Semiconductors
    Autorzy:
    Ivanov, V. Yu.
    Godlewski, M.
    Khachapuridze, A.
    Yatsunenko, S.
    Wojtowicz, T.
    Karczewski, G.
    Bergman, J. P.
    Monemar, B.
    Shamirzaev, T.
    Zhuravlev, K.
    Leonardi, K.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035757.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    72.25.Rb
    76.70.Hb
    78.55.Et
    Opis:
    In this work we employ technique of optically detected cyclotron resonance for evaluation of the role of localization processes in CdTe/CdMnTe and CdMnTe/CdMgTe quantum well structures. From microwave-induced changes of excitonic emissions we evaluate magnitude of potential fluctuations (Stokes shift), correlate optically detected cyclotron resonance results with the results of time-resolved experiments and discuss nature of recombination processes in the limit of a strong localization.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 559-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Spin-Glass Transition in Semimagnetic Quantum Wells Based on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te by Means of Optical Spectroscopy
    Autorzy:
    Zehnder, U.
    Yakovlev, D. R.
    Ossau, W.
    Waag, A.
    Landwehr, G.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968455.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    78.55.Et
    Opis:
    The spin-glass transition in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te epitaxial layers and bulk samples with 0.24 ≤ x ≤ 0.43 and in quantum well structures on the basis of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te were investigated by means of optical spectroscopy. Reduction of dimensionality of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te layers down to the quasi-two-dimensional case realized in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te/Cd$\text{}_{1- y}$Mn$\text{}_{y}$Te heterostructures frustrates the spin-glass formation, which is in agreement with theoretical predictions. The spin-glass formation is also frustrated in the vicinity of interfaces between semimagnetic and nonmagnetic semiconductors in CdTe/Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te quantum wells.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1075-1078
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Properties of ZnCoO Tetrapods and Nanofibers
    Autorzy:
    Gas, K.
    Fronc, K.
    Dziawa, P.
    Knoff, W.
    Wojciechowski, T.
    Zaleszczyk, W.
    Baranowska-Korczyc, A.
    Morhange, J.
    Paszkowicz, W.
    Elbaum, D.
    Karczewski, G.
    Wojtowicz, T.
    Szuszkiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791329.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.67.Bf
    81.05.Dz
    81.07.Bc
    Opis:
    In this paper the physical properties of two types of Co-doped ZnO nanostructures: tetrapods and nanofibers grown by a rapid thermal evaporation process and prepared by the electrospinning technique, respectively, were investigated and analyzed. Surface morphology of the samples was examined using scanning electron microscopy. X-ray diffraction measurements showed hexagonal wurtzite crystal structure of both types of investigated nanostructures. Both X-ray diffraction and Raman scattering data confirmed high phase purity of the samples. The magnetic properties studied with the use of the SQUID magnetometer confirmed a presence of ferromagnetic order in analyzed nanostructures. The observed photoluminescence spectra exhibited two groups of lines. The first one, in the ultraviolet spectral range, is due to the optical transitions close to ZnO band gap, the second one in the red region is most probably related to the $Co^{2+}$ d-d internal transitions. The influence of native defects on the optical properties is also shown and discussed. All results reported here lead us to the conclusion that in the mixed crystal nanostructures obtained, a fraction of the $Zn^{2+}$ ions is substituted by $Co^{2+}$ ions.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 868-870
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel CdTe/CdMgTe Graded Quantum Well Structures
    Autorzy:
    Wojtowicz, T.
    Kutrowski, M.
    Karczewski, G.
    Cywiński, G.
    Surma, M.
    Kossut, J.
    Yakovlev, D. R.
    Ossau, W.
    Landwehr, G.
    Kochereshko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968448.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    78.55.Et
    Opis:
    We report on growth and magnetooptical studies of two types of novel CdTe/CdMgTe quantum well structures having a precisely controlled grading of either the quantum well width or the donor concentration in a direction perpendicular to the growth axis. The presence of two-dimensional electron gas of varying concentration produced by the graded modulation doping was evidenced by observation of negatively charged exciton-electron complexes (X¯).
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1063-1066
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Ferromagnetism in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Based Quantum Wells
    Autorzy:
    Bertolini, M.
    Boukari, H.
    Ferrand, D.
    Cibert, J.
    Tatarenko, S.
    Gilles, B.
    Maślana, W.
    Gaj, J. A.
    Kossacki, P.
    Dietl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035587.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Hx
    75.50.Dd
    75.50.Pp
    78.55.Et
    Opis:
    New structures aiming at controlling the ferromagnetic properties of diluted magnetic semiconductor quantum wells are presented. The carrier density is controlled by applying a voltage across a p-i-n diode. A new method, creating a 2D hole gas by adjusting the distance between the quantum well and surface, offers opportunities for a broader range of structures.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 603-608
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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