Exciton-Mn exchange interactions as a function of translational wavevector in Cd1-xMnxTe quantum wells

C. Rice, L. C. Smith, J. J. Davies, D. Wolverson, M. Wiater, G. Karczewski, T. Wojtowicz

Research output: Contribution to journalArticle

Abstract

The exchange interaction between excitons and manganese ions have been studied in wide quantum wells of Cd 1-x Mn x Te with Cd 1-y Mg y Te barriers. The widths L of the wells are sufficiently large for the excitons to be described by the centre of mass approximation, in which the translational wavevector is quantised according to K z = Nπ/L. Excitonic transitions with different values of the quantisation index N can be resolved in the optical spectra. The giant Zeeman splittings induced by a magnetic field then enable the separate determination of the exchange energy for each value of the wavevector. We find that the quantity N 0 (α - β), which describes the exchange splitting, is constant to within 3% over the range of wavevectors up to 4 × 10 6 cm -1.
LanguageEnglish
Pages1826-1829
Number of pages4
JournalPhysica Status Solidi (C)
Volume9
Issue number8-9
DOIs
StatusPublished - 1 Aug 2012

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excitons
quantum wells
manganese ions
center of mass
optical spectrum
energy transfer
interactions
approximation
magnetic fields
ions

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Exciton-Mn exchange interactions as a function of translational wavevector in Cd1-xMnxTe quantum wells. / Rice, C.; Smith, L. C.; Davies, J. J.; Wolverson, D.; Wiater, M.; Karczewski, G.; Wojtowicz, T.

In: Physica Status Solidi (C), Vol. 9, No. 8-9, 01.08.2012, p. 1826-1829.

Research output: Contribution to journalArticle

Rice, C. ; Smith, L. C. ; Davies, J. J. ; Wolverson, D. ; Wiater, M. ; Karczewski, G. ; Wojtowicz, T./ Exciton-Mn exchange interactions as a function of translational wavevector in Cd1-xMnxTe quantum wells. In: Physica Status Solidi (C). 2012 ; Vol. 9, No. 8-9. pp. 1826-1829
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