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Excitons and Trions in Modulation Doped Structures in High Magnetic Fields

100%
Kochereshko V., Andronikov D., Platonov A., Crooker S., Barrick T., Karczewski G., Tronc P.
Acta Physica Polonica A
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2004
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vol. 106
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issue 3
319-328
EN
Photoluminescence spectra of modulation-doped CdTe/CdMgTe quantum well structures containing two-dimensional electron gases of low, moderate and high electron concentrations were studied in high magnetic fields up to 45 T. The recombination line of triplet trion state was found in the spectra. A model calculation of photoluminescence spectra in magnetic fields, which takes into account singlet and triplet trion states, was carried out. It was shown that the dark triplet becomes observable in photoluminescence spectra because it becomes the only recombination channel when the formation of the singlet trion state is suppressed by magnetic fields.
2
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Optical Anisotropy of ZnSe/BeTe Superlattices Probed by Excitonic Spectroscopy

84%
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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vol. 94
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issue 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.
3
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Motional Enhancement of Exciton Magnetic Moments

84%
Litvinov A., Kochereshko V., Cox R., Besombes L., Mariette H., Boukari H., Loginov D., Davies J., Smith L., Wolverson D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
161-165
EN
The phenomenon in which giant enhancement of exciton magnetic moments occurs due to translational motion was found for light hole excitons in ZnTe/ZnMgTe quantum well structures. Decreasing diamagnetic shifts as the number of the exciton quantized state increases were found for the first time.
4
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Model Study of Inhomogeneous Line Broadening in Excitonic Spectra of Quantum Wells

84%
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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vol. 94
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issue 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.
5
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Novel CdTe/CdMgTe Graded Quantum Well Structures

84%
Wojtowicz T., Kutrowski M., Karczewski G., Cywiński G., Surma M., Kossut J., Yakovlev D. R., Ossau W., Landwehr G., Kochereshko V.
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EN
We report on growth and magnetooptical studies of two types of novel CdTe/CdMgTe quantum well structures having a precisely controlled grading of either the quantum well width or the donor concentration in a direction perpendicular to the growth axis. The presence of two-dimensional electron gas of varying concentration produced by the graded modulation doping was evidenced by observation of negatively charged exciton-electron complexes (X¯).
6
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Excitonic Polaritons in Transverse Magnetic Fields

84%
Loginov D., Kochereshko V., Litvinov A., Besombes L., Mariette H., Davies J., Smith L., Wolverson D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
381-386
EN
Reflectivity spectra taken from wide quantum wells based on CdTe/CdZnTe and GaAs/AlGaAs (in which the well width is much larger than the exciton Bohr radius) were studied in magnetic fields in the plane of the well (the Voigt geometry). The energy splitting between bright and dark excitons and the redistribution of the oscillator strength from bright to dark was observed and this allowed us to determine the exciton exchange constantΔ. We found that exciton translational mass depends on the value of magnetic field. Additionally, we found that diamagnetic shift also depends on exciton wave vector. Changes in the spectra in the range of the overlap of heavy and light hole exciton resonances were observed when the magnetic field was inverted. Theoretical modeling of the spectra allowed us to explain all the observed features in the reflectivity spectra and to determine some material parameters.
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