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Verbin Y 《Physical review D: Particles and fields》1994,50(12):7318-7322
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A. N. Reznitskii A. V. Kornievskii A. A. Kiselev S. A. Permogorov L. N. Tenishev A. A. Klochikhin S. Yu. Verbin H. Gerlach M. Hetterich M. Grün C. Klingshirn 《Physics of the Solid State》1998,40(5):829-830
A theoretical and experimental study of the effect of a longitudinal magnetic field on optical orientation and magneto-circular
polarization of the luminescence of localized excitons in semiconducting solid solutions is reported. It is shown that recombination
takes place through two types of emitting states differing substantially in the degree of anisotropy, g factor, and spin relaxation time. Estimates are made of the g factors, anisotropic and exchange splittings, lifetime, and spin relaxation time of localized states in a CdS0.96Se0.04/GaAs solidsolution epitaxial layer.
Fiz. Tverd. Tela (St. Petersburg) 40, 900–902 (May 1998) 相似文献
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Low temperature emission spectra of localized excitons in CdS1?xSex solid solutions under the monochromatic excitation with tunable laser have been studied. It has been found that the luminescence of localized excitons has a high degree of linear polarization with respect to the polarization direction of exciting light. This polarization reflects the “hidden” anisotropy of macroscopically isotropic localized exciton system and strongly depends on the frequency of exciting light. Study of this dependence has permitted for the first time a determination of position of the “mobility edge” for exciton migration in disordered semiconductor solid solution. 相似文献
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S. Yu. Verbin I. Ya. Gerlovin I. V. Ignatiev M. S. Kuznetsova R. V. Cherbunin K. Flisinski D. R. Yakovlev M. Bayer 《Journal of Experimental and Theoretical Physics》2012,114(4):681-690
The time-resolved Hanle effect is examined for negatively charged InGaAs/GaAs quantum dots. Experimental data are analyzed by using an original approach to separate behavior of the longitudinal and transverse components of nuclear polarization. This made it possible to determine the rise and decay times of each component of nuclear polarization and their dependence on transverse magnetic field strength. The rise and decay times of the longitudinal component of nuclear polarization (parallel to the applied field) were found to be almost equal (approximately 5 ms). An analysis of the transverse component of nuclear polarization shows that the corresponding rise and decay times differ widely and strongly depend on magnetic field strength, increasing from a few to tens of milliseconds with an applied field between 20 and 100 mT. Current phenomenological models fail to explain the observed behavior of nuclear polarization. To find an explanation, an adequate theory of spin dynamics should be developed for the nuclear spin system of a quantum dot under conditions of strong quadrupole splitting. 相似文献
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S. A. Permogorov A. N. Reznitskii L. N. Tenishev A. V. Kornievskii S. Yu. Verbin S. V. Ivanov S. V. Sorokin W. von der Osten H. Stolz M. Jütte 《Physics of the Solid State》1998,40(5):743-744
Exciton dynamics in ZnCdSe/ZnSe quantum-well structures have been studied from luminescence spectra obtained at T=2 K. The energy and phase relaxation times of localized exciton states have been determined from a study of the destruction
of exciton optical alignment by an external magnetic field and direct measurements of the polarized-radiation decay kinetics
in the picosecond range. The exciton polarization lifetimes measured by two independent techniques are found to be in a good
agreement.
Fiz. Tverd. Tela (St. Petersburg) 40, 809–810 (May 1998) 相似文献
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Oulton R Greilich A Verbin SY Cherbunin RV Auer T Yakovlev DR Bayer M Merkulov IA Stavarache V Reuter D Wieck AD 《Physical review letters》2007,98(10):107401
A key to ultralong electron spin memory in quantum dots (QDs) at zero magnetic field is the polarization of the nuclei, such that the electron spin is stabilized along the average nuclear magnetic field. We demonstrate that spin-polarized electrons in n-doped (In,Ga)As/GaAs QDs align the nuclear field via the hyperfine interaction. A feedback onto the electrons occurs, leading to stabilization of their polarization due to formation of a nuclear spin polaron [I. A. Merkulov, Phys. Solid State 40, 930 (1998)]. Spin depolarization of both systems is consequently greatly reduced, and spin memory of the coupled electron-nuclear spin system is retained over 0.3 sec at temperature of 2 K. 相似文献
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I. V. Ignatiev S. Yu. Verbin I. Ya. Gerlovin R. V. Cherbunin Y. Masumoto 《Optics and Spectroscopy》2009,106(3):375-387
The spectrum and kinetics of the circular polarization of InP quantum dot (QD) photoluminescence have been experimentally investigated under different conditions of optical excitation and at different bias voltages applied to the sample. It is established that, at a bias of about ?0.1 V, the degree of photoluminescence polarization is negative and reaches ?50% in limiting cases. It is concluded that the negative polarization is formed in QDs containing one recident electron per dot and is mainly caused by the optical orientation of the electron spin. It is shown that all experimentally observed regularities are well described in the framework of the model assuming the energy relaxation of photogenerated electron-hole pairs accompanied by the electron- hole spin flip-flop process. 相似文献
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Zegers RG van Den Berg AM Brandenburg S Fleurot FR Fujiwara M Guillot J Hannen VM Harakeh MN Laurent H van Der Schaaf K van Der Werf SY Willis A Wilschut HW 《Physical review letters》2000,84(17):3779-3782
The (nat)Pb(3He,tp) reaction at E(3He) = 177 MeV was studied to identify 2Planck's over 2piomega isovector monopole strength in Bi isotopes. Monopole strength was found in the region -45
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