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    Wyświetlanie 1-7 z 7
    Tytuł:
    Many-Body Interactions in the CdTe-Based Quantum Well under Strong Optical Excitation
    Autorzy:
    Płochocka, P.
    Kossacki, P.
    Piechal, B.
    Maślana, W.
    Golnik, A.
    Cibert, J.
    Tatarenko, S.
    Gaj, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038365.pdf
    Data publikacji:
    2004-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.De
    71.35.Pq
    78.47.+p
    Opis:
    We performed pump-probe time-resolved absorption measurements on a modulation p-doped (Cd,Mn)Te quantum well. The density of the 2D hole gas was controlled, in the 10$\text{}^{10}$ cm$\text{}^{-2}$ range, by additional cw illumination. Interactions between photocreated neutral (X) and charged (X$\text{}^{+}$) excitons and the 2D hole gas were analyzed. We found that the strongest effect is the influence of the carriers on both X and X$\text{}^{+}$ optical resonances. Neutral and charged excitons are screened by holes, which results in the decrease in their intensities. We conclude from polarization resolved experiments that this screening is spin-dependent: it is more efficient between holes with opposite spins. Binding holes into the charged excitons reduces the screening of the neutral excitons and leads to an enhancement of the neutral exciton intensity. We also analyzed weaker effects, due to exciton-exciton interaction, at a constant hole density. We found that the reduction of the neutral exciton intensity due to two different mechanisms (phase-space filling and biexciton formation) is almost equal. We observed a spin-dependent blue shift of the neutral exciton line in the presence of a population of neutral excitons created by the pump pulse. Due to the attractive interaction between excitons with opposite spins, the corresponding shift of the neutral exciton is smaller than that observed due to the interaction between excitons with the same spins.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 3; 413-422
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Femtosecond Dynamics of Neutral and Charged Exciton Absorption in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Quantum Well
    Autorzy:
    Płochocka, P.
    Kossacki, P.
    Maślana, W.
    Radzewicz, C.
    Gaj, J. A.
    Cibert, J.
    Tatarenko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035611.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Fy
    78.47.+p
    78.67.De
    Opis:
    We present a study of time-dependent transmission spectra of a modulation-doped Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te/Cd$\text{}_{1-y-z}$Zn$\text{}_{y}$Mg$\text{}_{z}$Te quantum well with variable hole gas concentration. We study the influence of pump pulses on excitonic absorption in subpicosecond time scale. A spectrally broad probe pulse of duration of 40 femtoseconds was used to record the absorption spectra at controlled delay. Studies of temporal evolution of exciton energies revealed coherence decay of linearly polarized excitons and thermalization of non-equilibrium exciton states. We found that a characteristic timescale for thermalization of non-equilibrium populations of photocreated excitons is between 0.8 and 3.6 ps. The timescale of this process depends on the hole concentration in quantum well: for higher hole concentration the decay is faster. Long-lived photo-induced magnetization accompanied by heating of the magnetic system was also observed.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 679-686
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carrier Density Control by Illumination in Surface Doped, p-Type (Cd,Mn)Te Quantum Wells
    Autorzy:
    Maślana, W.
    Kossacki, P.
    Gaj, J. A.
    Ferrand, D.
    Bertolini, M.
    Tatarenko, S.
    Cibert, J.
    Kutrowski, M.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046939.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    78.67.De
    61.72.Vv
    Opis:
    We report both decrease and increase in the 2D carrier gas density in a simple (Cd,Mn)Te/(Cd,Mg)Te heterostructure with (Cd,Mn)Te quantum well. The two effects were achieved by light with different photon energies. The quantum wells were 10 nm wide with 2D hole gas supplied by surface states. For the sample with 25 nm cap layer thickness, it was possible to tune the hole gas concentration from almost empty well (hole density below 1×10$\text{}^{10}$ cm$\text{}^{-2}$) to 45×10$\text{}^{10}$ cm$\text{}^{-2}$. The illumination with 425 nm wavelength almost doubled the hole gas density from the initial 24×10$\text{}^{10}$ cm$\text{}^{-2}$. The depletion mechanism was most effective for illumination with the orange (575 nm) light.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 255-262
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excitonic Energy Shifts in CdMnTe/CdMgTe Quantum Wells under Resonant Excitation in Presence of 2D Carrier Gas
    Autorzy:
    Trajnerowicz, A.
    Golnik, A.
    Kossacki, P.
    Bardyszewski, W.
    Wiater, M.
    Karczewski, G.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811999.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.De
    71.35.Lk
    78.47.-p
    Opis:
    Systematic studies of amplitude and energy changes of excitonic lines in a strong excitation regime were carried out by a pump-probe method. The series of samples containing quantum wells with well width from 80 Åto 140 Åwas investigated. One 80 Åsample was n-doped with iodine, the rest of the quantum wells were intentionally undoped but contained a 2D gas of free holes. Its density could be varied by changing an intensity of additional illumination. The resonant creation of high population of e1hh1 excitons causes the energetic blue shift of the same due to interactions between excitons. The blue shifts did not depend on the concentration of 2D gas of carriers whereas it did depend on the power of excitation beam. Model calculations of absorption show qualitative agreement with the experimental data.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1403-1409
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cold and Hot Excitons in CdMnTe/CdMgTe Quantum Wells in Strong Excitation Regime and External Magnetic Field
    Autorzy:
    Trajnerowicz, A.
    Golnik, A.
    Kossacki, P.
    Bardyszewski, W.
    Wiater, M.
    Karczewski, G.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791298.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.De
    71.35.Lk
    78.47.-p
    Opis:
    Systematic studies of neutral heavy-hole excitonic line energy changes in a strong excitation regime were carried out by means of a pump-probe method for quantum wells containing a 2D gas of free holes. Energy shift of $X_{e1hh1}$ line was analyzed for different excitation energies at fixed delay between pump and probe pulses, also under external magnetic field. It was observed that this shift depends not only on the density of created excitons but also directly on the pump energy. In co-polarization configuration for excitation energy below an absorption resonance the energetic blue shift rises linearly with the elevated exciton density (localized excitons are created). For energies slightly above the resonance, the blue shift diminishes dramatically in spite of high exciton density present (delocalized excitons are created). Model absorption calculations are in qualitative agreement with the experimental data.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 849-851
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time-Resolved Studies of Excitonic Dynamics in a Wide II-VI Quantum Well by a Femtosecond Pump-Probe Reflectivity
    Autorzy:
    Trajnerowicz, A.
    Golnik, A.
    Kossacki, P.
    Pacuski, W.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047018.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.De
    71.35.Pq
    78.47.+p
    Opis:
    We present time-dependent reflectance spectra of wide (Cd,Mn)Te/(Cd,Mg)Te quantum wells. Interactions between excitons, trions, and carriers are studied for exciton densities up to 10$\text{}^{11}$ cm$\text{}^{-2}$. The resonant excitation at different excitonic lines is analyzed.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 395-401
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Studies of Charged Excitons
    Autorzy:
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027473.pdf
    Data publikacji:
    2001-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    78.40.Fy
    78.55.Et
    78.47.+p
    78.67.De
    Opis:
    A brief review is given of optical experiments related to creation and recombination of charged excitons. Their results are analyzed in terms of a simple three-particle free trion model. It is shown that the simple model explains well such results as temperature variation of lifetime and absorption intensity or photoluminescence line shape and a decrease in absorption oscillator strength per carrier with increasing carrier concentration. The range of applicability of the simple model is examined and found to be limited by two factors: disorder-induced localization and many-body interactions occurring and high carrier sheet concentrations (of order of 10$\text{}^{11}$ cm$\text{}^{-2}$).
    Źródło:
    Acta Physica Polonica A; 2001, 100, 2; 237-248
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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