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3 Acta Physica Polonica A

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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

2004

tom 106

nr 3

319-328

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.

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

2007

tom 112

nr 2

161-165

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.

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.

Acta Physica Polonica A

1997

tom 92

nr 5

1063-1066

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¯).