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1
Content available remote Magnetic Polaron Formation in Semimagnetic Semiconductor Heterostructures
100%
Yakovlev D.
Acta Physica Polonica A
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1996
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tom 90
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nr 4
703-714
EN
We present a survey of experimental and theoretical studies of exciton magnetic polarons in semimagnetic semiconductor epilayers, quantum wells and superlattices. The emphasis is on dynamical aspects of magnetic polaron formation in systems of different dimensionality.
2
Content available remote Effect of Magnetic Polaron Formation on the Exciton Mobility Edge in Cd_{1-x}Mn_{x}Te
45%
Mackh G. , Yakovlev D. , Ossau W. , Waag A. , Landwehr G.
Acta Physica Polonica A
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1995
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tom 87
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nr 1
265-268
EN
We study the exciton localization in the semimagnetic semiconductor Cd_{1-x}Mn_{x}Te by selective excitation of the exciton photoluminescence. We show that the energy position of the effective mobility edge for excitons is subject to the competition between nonmagnetic and magnetic localization due to the magnetic polaron formation. External magnetic fields affect this competition by suppressing the polaron formation, which shifts the mobility edge.
3
Content available remote Optically Detected Magnetic Resonance of Excess Electrons in CdTe/(Cd,Mg)Te Quantum Wells
38%
Hu C. , Ossau W. , Yakovlev D. , König B. , Wojtowicz T. , Karczewski G. , Kossut J.
Acta Physica Polonica A
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1998
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tom 94
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nr 2
351-354
EN
The spin resonance of excess electrons is observed with the detection either on the neutral or the negatively charged exciton X^{-} emission in type I CdTe/(Cd,Mg)Te quantum wells with excess electrons of low density. It is found that the electron spin-dependent and electron spin-conserving formation and recombination of X^{-} make the optical detection of the spin resonance of excess electrons feasible. For the first time, optically detected magnetic resonance is used to study fast optical transition processes in the nanosecond timescale where the microwave-induced magnetic transition rate is much lower than the optical transition rate.
4
Content available remote Effect of Spin-Glass Phase Formation on Exciton Magnetic Polaron in (Cd,Mn)Te
38%
Chudnovskiy A. L. , Rosenow B. , Oppermann R. , Yakovlev D. , Zehnder U. , Ossau W.
Acta Physica Polonica A
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1996
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tom 90
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nr 4
755-758
EN
The influence of the spin-glass phase formation of the (Cd,Mn)Te semimagnetic layers on properties of the exciton magnetic polaron were investigated both theoretically and experimentally. The theoretical model offers a consistent description of the temperature dependence of the exciton magnetic polaron energy in the vicinity of spin-glass transition and shows good agreement with the experimental data.
5
Content available remote Exciton Exchange between Nearly-Free and Acceptor-Bound States of a Positive Trion Assisted by Cyclotron Excitation
32%
Jadczak J. , Bryja L. , Wójs A. , Bartsch G. , Yakovlev D. , Bayer M. , Plochocka P. , Potemski M. , Reuter D. , Wieck A.
Acta Physica Polonica A
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2011
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tom 119
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nr 5
600-601
EN
In magneto-photoluminescence spectra of a two-dimensional hole gas in a GaAs quantum well we observe coupling of two different radiative states. The pair of coupled states are an acceptor-bound trion AX^{+} and an essentially free (only weakly localized by a shallow lateral potential) trion X^{+}, brought into resonance by an additional cyclotron excitation controlled by the magnetic field. The coupling mechanism is the exciton transfer, and the optical signature is a clear anticrossing of the emission lines of an X^{+} and a cyclotron replica of the AX^{+}.
6
Content available remote Model Study of Inhomogeneous Line Broadening in Excitonic Spectra of Quantum Wells
32%
Astakhov G. , Kochereshko V. , Kosobukin V. , Yakovlev D. , Wojtowicz T. , Karczewski G. , Kossut J. , Ossau W. , Landwehr G.
Acta Physica Polonica A
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1998
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tom 94
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nr 2
235-239
EN
An approach is proposed to estimate separately parameters of homogeneous and inhomogeneous broadenings from an optical reflection line of a quasi-2D exciton. A phenomenological model is proposed to take into account statistically an inhomogeneous broadening of the exciton resonant spectra. The concept is applied to study a modulation-doped heterostructures with a single quantum well CdTe/CdMgTe. From exciton reflection lines taken in a magnetic field the temperature-dependent homogeneous and inhomogeneous broadening parameters as well as the exciton radiative decay rate are measured.
7
Content available remote Optical Anisotropy of ZnSe/BeTe Superlattices Probed by Excitonic Spectroscopy
32%
Platonov A. , Kochereshko V. , Ivchenko E. , Yakovlev D. , Ossau W. , Fischer F. , Waag A. , Landwehr G.
Acta Physica Polonica A
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1998
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tom 94
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nr 3
479-482
EN
Photoluminescence spectra of type-II ZnSe/BeTe superlattices were studied. A linear polarised photoluminescence has been found in the spectral range of spatially indirect exciton transitions. This observation is interpreted in a model of optical anisotropy of heterostructures with no-common atom at interfaces.
8
Content available Electron Spins in Self-Assembled (In,Ga)As/GaAs Quantum Dots Studied by Pump-Probe Faraday Rotation
26%
Greilich A. , Yugova I. , Oulton R. , Zhukov E. , Yakovlev D. , Bayer M. , Shabaev A. , Efros A. , Stavarache V. , Reuter D. , Wieck A.
Acta Physica Polonica A
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2006
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tom 110
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nr 3
287-293
EN
Static and dynamic properties of electron spins in self-assembled (In,Ga)As/GaAs quantum dots which contain on average a single electron per dot were studied by pump-probe Faraday rotation. Examples given here are the g-factor tensor components as well as the dephasing time T*_2 within a dot ensemble.
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