Spin-Exchange Interaction in ZnO-based Quantum Wells

Details Spin-Exchange Interaction in ZnO-based Quantum Wells Spin-Exchange Interaction in ZnO-based Quantum Wells

2006-03-17

arxiv.org/abs/cond-mat/0603457v2

Physics

Condensed Matter

Other Condensed Matter

14 pages, 3 figures

Scientific paper

10.1103/PhysRevB.74.153302

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.

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