Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 57: Focussed Session: ZnO-based Semiconductors

HL 57.2: Talk

Thursday, March 25, 2010, 14:30–14:45, H17

Magneto-optical properties of bound excitons in ZnO — •Benjamin Neuschl, Martin Feneberg, and Klaus Thonke — Institute of Quantum Matter, University of Ulm

High resolution, low temperature magneto-photoluminescence of ZnO single crystals is recorded in magnetic fields up to 28 Tesla. Full width at half maximum below 80 µ eV for bound excitons and strong magnetic perturbation allow to observe rich splitting patterns of degenerate energy states and allow a unique insight into the magneto-optical properties of bound excitons. Interaction with excited rotor and valence band states of the hole involved are taken into account to obtain a perfect fit to the experimental data. By comparing the intensity dependence of the fine structure of single bound excitons at different temperatures and magnetic field orientations, we are able to clearly distinguish between donor and acceptor bound excitons, as well as between transitions assigned to ground or excited hole states.