Antiferromagnetic coupling in CdSe/ZnMnSe quantum dot structures

• Spin polarization of nonmagnetic CdSe quantum dots (QDs) coupled to adjacent ZnMnSe diluted magnetic semiconductor (DMS) is investigated by CW and time-resolved magneto-optical spectroscopy under tunable laser excitation. Efficient enhancement in the degree of σ− circular polarization of photoluminescence from the CdSe QDs is observed under optical excitation at the σ+-active exciton state of the DMS. The fact that the enhancement persists much longer than the exciton lifetime of the DMS rules out a role of the DMS excitons. A possible explanation is discussed in terms of antiferromagnetic coupling between the excitons in QDs and aligned Mn ions in DMS.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

antiferromagnetic materials

cadmium compounds

excitons

II-VI semiconductors

magnetic epitaxial layers

magnetic multilayers

magneto-optical effects

manganese compounds

photoluminescence

semiconductor epitaxial layers

semiconductor quantum dots

semimagnetic semiconductors

time resolved spectra

wide band gap semiconductors

zinc compounds

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