Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)
MA 32.72: Poster
Freitag, 29. Februar 2008, 11:15–14:00, Poster E
Rabi Oscillations in a Mn doped Quantum Dot — •Doris E. Reiter1, Svea Sauer1, Vollrath Martin Axt2, and Tilmann Kuhn1 — 1Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str.10, 48149 Münster — 2Institut für Theoretische Physik III, Universität Bayreuth, 95440 Bayreuth
The understanding of spin flips in diluted magnetic semicondutors is of fundamental interest for the application to quantum technologies. Recent experimental results prove the fabrication of a single semiconductor quantum dot with a single Mn atom. When an exciton is present in this system the PL line splits up, clearly showing the influence of the Mn spin. We analyze the ultrafast dynamics of exciton and Mn spin after optical excitation in the presence of the Mn-exciton exchange interaction. The temporal behavior of both exciton state and Mn state exhibits a spin flip, which can also be described by Rabi oscillations between a bright and a dark exciton state accompanied by oscillations in the spin orientation of the Mn atom. By means of ultrashort laser pulses the Mn spin can thus be raised or lowered by one on a time scale of a few picoseconds.