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4 Acta Physica Polonica A

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Exciton Magnetic Polaron Features in Photoluminescence Excitation Spectra of CdTe/(CdMn)Te Quantum Wells with High Mn Contents

100%

Mackh G. , Ossau W. , Yakovlev D. R. , Landwehr G. , Wojtowicz T. , Karczewski G. , Kossut J.

Acta Physica Polonica A

1995

tom 88

nr 5

849-852

Exciton magnetic polarons are studied in CdTe/Cd_{1-x}Mn_{x}Te (0.4 ≤ x ≤ 0.8) quantum wells. The magnetic polaron formation leads to the appearance of an additional line in the photoluminescence excitation spectra, which can be employed to determine the Zeeman splittings more exactly than by using the free exciton peak. We find an overall increase in the polaron energy with increasing x in the whole range of Mn contents studied.

Exciton States in Type-II ZnSe/BeTe Quantum Wells

84%

Platonov A. V. , Yakovlev D. R. , Zehnder U. , Kochereshko V. P. , Ossau W. , Fischer F. , Litz T. , Waag A. , Landwehr G.

Acta Physica Polonica A

1997

tom 92

nr 5

953-957

We present an optical investigation of novel heterostructures based on beryllium chalcogenides with a type-I and type-II band alignment. In the type-II quantum well structures (ZnSe/BeTe) we observed a strong exciton transition involving an electron confined in the conduction band well and a hole localized in the valence band barrier (both in ZnSe layer). This transition is drastically broadened by the temperature increase due to enhanced exciton-acoustic phonon interaction.

Investigation of Spin-Glass Transition in Semimagnetic Quantum Wells Based on Cd_{1-x}Mn_{x}Te by Means of Optical Spectroscopy

84%

Zehnder U. , Yakovlev D. R. , Ossau W. , Waag A. , Landwehr G. , Wojtowicz T. , Karczewski G. , Kossut J.

Acta Physica Polonica A

1997

tom 92

nr 5

1075-1078

The spin-glass transition in Cd_{1-x}Mn_{x}Te epitaxial layers and bulk samples with 0.24 ≤ x ≤ 0.43 and in quantum well structures on the basis of Cd_{1-x}Mn_{x}Te were investigated by means of optical spectroscopy. Reduction of dimensionality of Cd_{1-x}Mn_{x}Te layers down to the quasi-two-dimensional case realized in Cd_{1-x}Mn_{x}Te/Cd_{1- y}Mn_{y}Te heterostructures frustrates the spin-glass formation, which is in agreement with theoretical predictions. The spin-glass formation is also frustrated in the vicinity of interfaces between semimagnetic and nonmagnetic semiconductors in CdTe/Cd_{1-x}Mn_{x}Te quantum wells.

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¯).