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RISS 인기검색어
- 검색키워드
- 저자 : Henri Mariette (검색결과 3 건)
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Kinetics of Circular Polarization in p-Doped Single Quantum Dots
Yoan Leger,Lucien Besombes,Laurent Maingault,Henri Mariette 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
We report time-resolved photoluminescence experiments in p-doped single CdTe/ZnTe quantum dots (QDs) with a number of resident holes ranging from 0 to 2. Under resonant circularly polarized excitation on an excited state, the charged species present a large polarization rate at a short time delay. A signicant reduction of this initial polarization rate is observed during the recombination time. This reduction is faster for the QD containing two holes than for the QD doped with a single hole. This eect is interpreted in terms of the interplay between the S electron - P hole anisotropic exchange interaction and the irreversibility due to either the thermalization or the recombination. We report time-resolved photoluminescence experiments in p-doped single CdTe/ZnTe quantum dots (QDs) with a number of resident holes ranging from 0 to 2. Under resonant circularly polarized excitation on an excited state, the charged species present a large polarization rate at a short time delay. A signicant reduction of this initial polarization rate is observed during the recombination time. This reduction is faster for the QD containing two holes than for the QD doped with a single hole. This eect is interpreted in terms of the interplay between the S electron - P hole anisotropic exchange interaction and the irreversibility due to either the thermalization or the recombination.
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Molecular Beam Epitaxy Growth of ZnTe/ZnSe Type-II Quantum Dots
Rita Najjar,Regis Andre,Lucien Besombes,Catherine Bougerol,Henri Mariette,Serge Tatarenko 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
We have performed a detailed study of the growth conditions of ZnTe strained on ZnSe to form nanometer-scale islands. We determined that the critical thickness for strain relaxation was 2 ML, rapidly followed by the onset of surface undulations due to a layer instability. Nevertheless, the changes in the surface morphology were not marked enough if the purpose was to obtain quantum dots. Finally, we present an ecient technique to form ZnTe islands with a typical base extension of 25 nm and a height of 3 nm. We have performed a detailed study of the growth conditions of ZnTe strained on ZnSe to form nanometer-scale islands. We determined that the critical thickness for strain relaxation was 2 ML, rapidly followed by the onset of surface undulations due to a layer instability. Nevertheless, the changes in the surface morphology were not marked enough if the purpose was to obtain quantum dots. Finally, we present an ecient technique to form ZnTe islands with a typical base extension of 25 nm and a height of 3 nm.
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Lee, Woojin,Kim, Minwoo,Yang, Hanyi,Kyhm, Kwangseuk,Murayama, Akihiro,Kheng, Kuntheak,Mariette, Henri,Dang, Le Si Optical Society of Korea 2018 Current Optics and Photonics Vol.2 No.6
We have investigated the dimensional nature of center-of-mass exciton confinement states in a CdMnTe/CdTe/CdMnTe heterostructure, where the CdTe well is too wide (144 nm) to confine both electrons and holes but able to confine whole excitons in the center-of-mass coordinate. Fine multiple photoluminescence spectra with a few meV separation were observed at 6 K. From the thickness dependence of the transition rate, they were attributed to even numbered center-of-mass exciton confinement states (N = 2, 4, 6, ${\cdots}$, 18). Dimensionality of the center-of-mass exciton confinement states was also investigated in terms of temperature dependence of radiative decay time. At low temperatures (${\leq}12K$), we found that the ground state excitons are likely localized possibly due to the barrier interface fluctuation, resulting in a constant decay time (~350 ps). With increased temperature (${\geq}12K$), localized excitons are thermally released, giving rise to a linear temperature dependence of radiative decay time as an evidence of two-dimensional nature.
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