Spin-exchange interaction in ZnO-based quantum wells.
- Others:
- Groupe d'étude des semiconducteurs (GES) ; Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS)
- Institut Universitari de Ciencia dels Materials (ICMUV) ; Universitat de València (UV)
- Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)
Description
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 3nm, 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 canceled by the dominant effect of internal electric fields, which dramatically reduces the exchange energy.
Abstract
International audience
Additional details
- URL
- https://hal.archives-ouvertes.fr/hal-01304535
- URN
- urn:oai:HAL:hal-01304535v1
- Origin repository
- UNICA