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Baranov  P. G.  Romanov  N. G.  Tolmachev  D. O.  Babunts  R. A.  Namozov  B. R.  Kusrayev  Yu. G.  Sedova  I. V.  Sorokin  S. V.  Ivanov  S. V. 《JETP Letters》2008,88(9):631-635
JETP Letters - The axial fine structure with strong positive zero-field splitting for Mn2+ ions in CdMnSe/ZnSe quantum dots caused by their low dimensionality was revealed. Magnetic resonance was...  相似文献   
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A method based on the optical orientation technique was developed to measure the nuclear-spin lattice relaxation time T 1 in semiconductors. It was applied to bulk n-type GaAs, where T 1 was measured after switching off the optical excitation in magnetic fields from 400 to 1200 G at low (< 30 K) temperatures. The spin-lattice relaxation of nuclei in the studied sample with n D = 9 × 1016 cm?3 was found to be determined by hyperfine scattering of itinerant electrons (Korringa mechanism) which predicts invariability of T 1 with the change in magnetic field and linear dependence of the relaxation rate on temperature. This result extends the experimentally verified applicability of the Korringa relaxation law in degenerate semiconductors, previously studied in strong magnetic fields (several Tesla), to the moderate field range.  相似文献   
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The luminescence characteristics of M 3+: Al2O3 crystals, where M 3+ stands for an isoelectronic cation impurity with a filled electron shell, namely, Sc3+, Y3+, or La3+, were studied. The luminescence of excitons bound (BE) to these impurities was detected. The position of the BE energy states at the long-wavelength absorption edge as a function of the M 3+ ionic radius was established. The energies of the long-wavelength BE creation threshold and of the maximum of the BE luminescence band were approximated empirically by third-order polynomials of the Toyozawa polynomial type, which describes electron-phonon interaction. The energy and spatial structure of the BE was found to be similar to that of a self-trapped exciton (STE). The BE and STE states are separated by an energy barrier, and energy transfer from the STE to BE is frozen at low temperatures.  相似文献   
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Optically detected magnetic resonance (ODMR) was applied to reveal the exchange interaction effects between Mn2+ ions and confined holes in (Cd,Mn)Te quantum wells with 2D hole gas. Two anisotropic ODMR signals with different angular variations were found and ascribed to isolated manganese ions and to exchange-coupled complexes consisting of manganese and holes. It is shown that calculations on the basis of spin Hamiltonian for these systems are in agreement with the experimental data.  相似文献   
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Optical properties, including luminescence, of scandium-doped α-Al2O3 crystals have been studied in the VUV range. An absorption band associated with the scandium impurity was observed at the fundamental-absorption edge of crystalline corundum. A strong luminescence band peaking at 5.6 eV, which is most effectively excited within the 7.7–8.8-eV interval, was found. The kinetic and polarization characteristics of this luminescence were studied within the temperature range 6–500 K. An excitation model of the impurity complex and the mechanism of its relaxation are discussed. Fiz. Tverd. Tela (St. Petersburg) 40, 653–654 (April 1998)  相似文献   
6.
The effect of different distortions arising in nanostructures and of external fields on polarization of radiation has been studied. Occurrence of linear polarization of photoluminescence in a magnetic field applied in the plane of a structure containing a CdTe/CdMnTe quantum well has been considered. The influence of a magnetic field on the effects of optical orientation and optical alignment of excitons and trions in self-assembled CdSe/ZnSe quantum dots has been investigated. Analysis of the experimental data reveals low symmetry of the structures studied. It is shown that the distribution of the anisotropy axes in the plane of nanostructures is nearly random.  相似文献   
7.
The axial fine structure with strong positive zero-field splitting for Mn2+ ions in CdMnSe/ZnSe quantum dots caused by their low dimensionality was revealed. Magnetic resonance was measured as a variation of photoluminescence intensity. In spite of isotropic g factor of Mn2+ ions, the anisotropic behavior of the center of gravity of the resonance has been observed because of the high Boltzmann factor at 35 GHz and 2 K. The article is published in the original.  相似文献   
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The luminescence excitation spectra and the electron excitation relaxation features of Al2O3, YAP, YAG, and YGG crystals are discussed from the viewpoint of the specificity caused by the complexity of the unit cell. The branching of relaxation is observed between the usual channel, characteristic of the simple wide-band insulators, and the one connected with the nonbonding states appearing in complex oxides. A model describing such branching is proposed. For comparison, the luminescent features of a CaWO4 crystal containing clearly separable oxyanion structures (in contrast to the crystals mentioned) are studied.  相似文献   
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