Abstract
AbstractThe spin dynamic of the hole localized inside the donor bound exciton (D0X) and donor electrons is studied in ZnO epilayer by time‐resolved optical orientation of the D0X photoluminescence and the absorption bleaching of the spin‐sensitive D0X transition, respectively. A D0X life time of 140 ps and hole spin relaxation time of 80 ps are extracted. The comparable times allows us for an effective pumping of the donor electron spin via circularly polarized excitation.Long electron spin relaxation times in the 1 μs range are uncovered if the hyperfine interaction is suppressed by a proper longitudinal magnetic field B‖. A field strength of ≈2 mT is large enough to achieve that proving the extremely small Overhauser field BN acting on localized electrons. This is a direct result of the small abundance of magnetic nuclei interacting inside the small donor volume both specific for ZnO. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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