Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.49: Poster

Montag, 23. März 2009, 14:30–17:00, P2

Energy dynamics in ZnSe/ZnMnSe double-quantum-well structures — •Stephanie Jankowski, Wolfram Heimbrodt, Swantje Horst, Alexej Chernikov, and Sangam Chatterjee — Department of Physics and Material Sciences Center, Phillipps-University Marburg, Renthof 5, 35032 Marburg

Asymmetric ZnSe/ZnMnSe double-quantum-well (DQW) structures with different barrier width have been grown between dilute magnetic ZnMnSe cladding layers on a (100) GaAs substrate with a ZnSe buffer. The DQWs have been studied by cw and time resolved spectroscopy in external magnetic fields up to 7 Tesla. The ZnSe quantum wells are under tensile strain in these DQW structures yielding the light-hole exciton states to be the energetically lowest lying states. This is the main difference to earlier papers, where tunnelling of carriers and excitons have been studied in DQW structures with heavy hole excitons being the lowest lying states. In the magnetic field we were able to change the barrier height, to split the states of the wells due to the Giant-Zeeman-effect of the ZnMnSe barriers and to manipulate the radiationless energy transfer processes between the 3d-internal transitions and the excitonic states. As a result of the sophisticated interaction of these mechanisms a unique excitation energy dynamics was found and will be discussed in detail.