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Institut f. Physik FG Nanostrukturierte Materialien
Martin-Luther-Universitat Halle-Wittenberg
Von-Danckelmann-Platz 3, D-06120 Halle, Germany
Tel.: +49 345 55 25321
Fax.: +49 345 55 27034
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J. Seufert, G. Bacher, H. Schömig, A. Forchel, L. Hansen, G. Schmidt, L.W. Molenkamp Spin injection into a single self-assembled quantum dot Phys. Rev. B 69 (3) (2015-02-24 16:15:02), 035311/1-035311/4
We demonstrate spin injection into a single self-assembled CdSe/ZnSe quantum dot using a semimagnetic BeMnZnSe spin aligner. Comparing quasiresonant excitation of the single quantum dot to excitation above the spin-aligner band gap, spin injection is evidenced by a strong increase of the polarization degree of the single quantum dot photoluminescence emission even at small magnetic fields. A spin injection efficiency into a single quantum dot of about 70% can be estimated. From a detailed analysis of the polarization degree, we derive an exciton spin-relaxation time from the upper to the lower Zeeman level of about a nanosecond in the quantum dot, independent of magnetic field. http://dx.doi.org/10.1103/PhysRevB.69.035311 |
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