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American Physical Society, Physical review B, 15(74), 2006

DOI: 10.1103/physrevb.74.153302

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Spin-exchange interaction inZnO-based quantum wells

Journal article published in 2006 by B. Gil, P. Lefebvre, T. Bretagnon, T. Guillet ORCID, J. A. Sans, T. Taliercio, C. Morhain
This paper is available in a repository.
This paper is available in a repository.

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Abstract

14 pages, 3 figures ; Wurtzitic ZnO/(Zn,Mg)O quantum wells grown along the (0001) direction permit unprecedented tunability of the short-range spin exchange interaction. In the context of large exciton binding energies and electron-hole exchange interaction in ZnO, this tunability results from the competition between quantum confinement and giant quantum confined Stark effect. By using time-resolved photoluminescence we identify, for well widths under 3 nm, the redistribution of oscillator strengths between the A and B excitonic transitions, due to the enhancement of the exchange interaction. Conversely, for wider wells, the redistribution is cancelled by the dominant effect of internal electric fields, which dramatically reduce the exchange energy.