Autor: Hawrylak, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Many-Exciton Complexes in Self-Assembled Quantum Dots
Autorzy:: Wójs, A.
Hawrylak, P.
Jacak, L.
Powiązania:: https://bibliotekanauki.pl/articles/1952721.pdf
Data publikacji:: 1996-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.20.Dx
71.45.Gm
78.66.Fd
Opis:: The system of interacting electrons and holes confined in a lens-shaped InGaAs self-assembled dot is studied using exact diagonalization techniques. The single-particle energy spectrum of self-assembled dot is well approximated by that of a quasi-two-dimensional atom with parabolic lateral confinement. The electronic shell structure of self-assembled dot is responsible for a remarkable dependence of the absorption/emission spectrum on the number of excitons. This is explained in terms of hidden symmetries leading to a formation of coherent many-exciton states of weakly interacting excitons and bi-excitons.
Źródło:: Acta Physica Polonica A; 1996, 90, 5; 1108-1112
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Spectroscopy of Charged Donors and Many-Electron Effects in Semiconductor Quantum Wells
Autorzy:: McCombe, B. D.
Jiang, Z. X.
Tischler, J. G.
Weinstein, B. A.
Hawrylak, P.
Powiązania:: https://bibliotekanauki.pl/articles/2011126.pdf
Data publikacji:: 1999-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.20.Dx
73.20.Hb
78.66.Fd
Opis:: Far infrared magnetospectroscopic studies of negative donor ions (D$\text{}^{-}$), and donors in the presence of many excess electrons in high magnetic fields in GaAs/AlGaAs quantum wells are reviewed. Both singlet and triplet transitions of well-center D$\text{}^{-}$ions were observed and are in good agreement with recent theoretical calculations. For off-well-center D$\text{}^{-}$ions evidence for a predicted magnetic-field-induced "unbinding" of the second electron was found. In the presence of many excess electrons the D$\text{}^{-}$singlet and -triplet transitions are blue-shifted substantially and evolve into bound magnetoplasmon excitations. Cusps are observed at integral and fractional Landau-level filling factors (ν) in a plot of normalized blue-shift of the D$\text{}^{-}$singlet-like bound magnetoplasmon transition vs. ν. For ν<1, the singlet-like bound magnetoplasmon transition continuously approaches the isolated D$\text{}^{-}$singlet transition with increasing magnetic field, while the triplet-like transition loses strength, irrespective of the electron density. Exact diagonalization studies of a donor ion with a few electrons in a parabolic lateral confining potential show the importance of electron-electron interactions and localization due to the long-range fluctuating potential in explaining this behavior. High pressure studies in a specially designed diamond anvil cell exhibit a continuous evolution from bound magnetoplasmon transitions to isolated D$\text{}^{-}$transitions to neutral donor transitions in a single sample as the pressure is increased and the electron density in the wells is decreased.
Źródło:: Acta Physica Polonica A; 1999, 96, 5; 559-572
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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