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    Wyświetlanie 1-4 z 4
    Tytuł:
    Energy and Optical Absorption Spectra of Multiply Charged Anisotropic Quantum Boxes
    Autorzy:
    Trojnar, A.
    Małachowski, T.
    Wójs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047372.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.-f
    78.67.Hc
    71.35.-y
    71.35.Pq
    Opis:
    Using a simple model of a two-dimensional rectangular quantum box we study the effects of size and anisotropy on the energy and photoluminescence spectra of neutral and charged quantum dots. The competition of symmetries and energy/length scales of the free exciton or trion and of the confining potential is analyzed. The numerical calculations consisted of the diagonalization of the few-electron-hole Hamiltonian matrices in the full configuration-interaction basis, with the simultaneous resolution of the conserved orbital and spin quantum numbers.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 173-176
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charging Effects in Self-Assembled CdTe Quantum Dots
    Autorzy:
    Kłopotowski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492785.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    32.60.+i
    71.35.Pq
    71.55.Gs
    Opis:
    In this review, we summarize our achievements in controlling and understanding the charging effects in single self-assembled CdTe quantum dots. We start with analysis of the single dot emission spectrum. For excitation densities small enough to ensure only s-shell recombination, we find that for all dots (also those reported by other groups) the same transition sequence is observed. Namely, the neutral exciton recombination has the highest energy while charged exciton and biexciton transitions are redshifted. This observation remains in a stark contrast to self-assembled InGaAs dots, where charged complexes may appear also on the high energy side of the neutral exciton. We explain the universality of the transition sequence assuming domination of the Coulomb correlations over direct, single particle interactions. Furthermore, through measurement of the recombination rates, we gain access to electron and hole wave functions and their redistributions upon changing the dot occupancy. We find that the electron wave function is rather stiff, while the hole wave function is rather soft owing to enhanced correlations in the valence band. We then corroborate these conclusions with the Stark spectroscopy, where we analyze energy shifts due to electric field imposed on dots embedded in a field effect or diode structure. Finally, we use these structures to obtain controllable tuning of the charge state. We discuss different approaches to this task and find the best tuning efficiency for a structure with enhanced valence band confinement.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 819-829
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Internal Transitions of Charged Excitons in AlGaAs/GaAs Lateral Fluctuation Quantum Dots
    Autorzy:
    Meining, C. J.
    Whiteside, V. R.
    McCombe, B. D.
    Nickel, H. A.
    Petrou, A.
    Tischler, J. G.
    Bracker, A. S.
    Gammon, D.
    Dzyubenko, A. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038344.pdf
    Data publikacji:
    2004-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    71.35.Pq
    73.21.La
    78.55.Cr
    78.67.Hc
    Opis:
    Low temperature measurements of magneto-photoluminescence and optically detected resonance spectroscopy in magnetic fields up to 10~T were carried out on GaAs/Al$\text{}_{0.3}$Ga$\text{}_{0.7}$As quantum well samples grown by molecular beam epitaxy with lateral fluctuation quantum dots produced by growth interruption. Monolayer fluctuations of the quantum well width form lateral quantum dots for which confinement energies are less than Coulomb correlation energies. Five different width quantum wells (2.8-14.1 nm) were grown in a single sample, doped in the barriers with Si donors to allow for photoluminescence of both excitons and trions. We report studies of the optically detected resonance spectra associated with the ensemble photoluminescence of all of the wells including observation of bound-to-continuum internal transitions of trions, both singlet and triplet, and electron cyclotron resonance for the wider wells, which also show a clear bound-to-bound triplet transition. The latter is forbidden by magnetic translational invariance, but can be seen in these samples because this symmetry is broken by the lateral fluctuations, whose characteristic dimensions are greater than the trion orbit size. The two narrowest wells show strong broad optically detected resonance signals associated with inhomogeneously broadened internal transitions of the strongly correlated trions in the lateral dots. The optically detected resonance signals peak well below the calculated positions of electron cyclotron resonance. As expected for localized carriers and excitons, there is no free electron cyclotron resonance. We also present preliminary measurements of optically detected resonance spectra from a single dot.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 3; 383-393
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlling the biexciton-exciton cascade kinetics in a quantum dot via coupling to a microcavity optical mode
    Autorzy:
    Sęk, G.
    Krizhanovskii, D.
    Kulakovskii, V.
    Reitzenstein, S.
    Kamp, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1160147.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    71.35.-y
    78.55.-m
    42.50.Pq
    Opis:
    The luminescence of single and two exciton states in a quantum dot embedded in the active layer of a micropillar cavity has been investigated. Temperature tuning has been used to bring the energy states of the quantum dot and the cavity into resonance. Studying the resonance behavior of the exciton and biexciton transitions with cavity mode revealed a similar Purcell effect for both lines. The cavity-induced changes of the respective radiative lifetimes have been shown to allow for controlling the ratio between the single and two exciton occupation and their relative emission rates in a single quantum dot.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-44-A-47
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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