Optical Properties of Diluted Magnetic Semiconductor Quantum Structures

• Authors: M. Dobrowolska , H. Luo , J.K. Furdyna
• Languages of publication: EN

Abstracts

EN

Conduction and valence band edges in diluted magnetic semiconductors undergo enormous Zeeman shifts when a magnetic field is applied, reach­ing values in excess of 100 meV at low temperatures. These Zeeman shifts can thus have profound consequences on the properties of DMS/non-DMS heterostructures, since they provide the opportunity of tuning their band alignment by varying an applied field. This leads to a variety of entirely new effects, and also provides a powerful tool for probing the effect of band alignment on the properties of semiconductor heterostructures in general. We illustrate this with several examples. First, using the ZnSe/ZnMnSe sys­tem, we discuss the creation of a spatial spin modulation (spin superlattice). Second, we use the drastic differences in the Zeeman splitting occurring in different layers of a DMS/non-DMS superlattice in order to pinpoint the localization in space of the specific electronic states involved in optical tran­sitions. We illustrate this by investigating the localization of above-barrier states in type-I ZnSe/ZnMnSe superlattices, and of spatially-direct (type-I) excitons which occur in ZnTe/CdMnSe and ZnMnTe/CdSe type-II super-lattices. Finally, we exploit Zeeman tuning to demonstrate the confinement effects which occur in a single quantum barrier.

Keywords

EN

75.30.Et; 73.20.Dx; 68.55.Bd; 78.20.Ls

• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 87
• Issue: 1
• Pages: 95-106

Dates

published

1995-01

Contributors

author

M. Dobrowolska

• Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA

author

H. Luo

• Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA

author

J.K. Furdyna

• Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA