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SYQI: Quantum information processing in condensed media
SYQI 1: Quantum information processing in condensed media I
SYQI 1.2: Vortrag
Montag, 24. März 2003, 14:00–14:15, HSZ/01
Optical Rabi Oscillations in an InGaAs Quantum Dot Ensemble — •W. Langbein1, P. Borri1, S. Schneider1, U. Woggon1, R. L. Sellin2, D. Ouyang2, and D. Bimberg2 — 1Exp. Physik IIb, Universität Dortmund, Otto-Hahn-Str. 4, 44221 Dortmund — 2Institut für Festkörperphysik TU, Hardenbergstrasse 36, D-10623 Berlin, Germany
We present measurements and calculations of optical Rabi oscillations in the excitonic ground-state transition of an InGaAs quantum dot ensemble at low temperature [1]. We observe Rabi oscillations which are damped versus pulse area and change period when changing pulse duration. Comparisons with calculations show that the observed damping is not intrinsic to a single dot. Dephasing processes and the biexciton resonance change the amplitude and the period of the oscillations, respectively, while the damping versus pulse area is attributed to a distribution of transition dipole moments in the ensemble. Measurements performed at different pulse durations corroborate this interpretation. They also reveal the presence of non-resonant two-photon absorption in the barrier region, covering the Rabi oscillations for short pulse durations.
[1] P. Borri et al., Phys. Rev. B 66, 081306(R) (2002)