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AIP conference proceedings

Excitonic Rabi Oscillations in a Strain-compensated Quantum Dot Ensemble

Junko Ishi‐Hayase, Mamiko Kujiraoka, S. Mitsutake, Kouichi Akahane, Naokatsu Yamamoto, Kazuhiro Ema, Masahide Sasaki, Jisoon Ihm, Hyeonsik Cheong

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We present experimental measurements and theoretical analysis of Rabi oscillations of the exciton polarization in a strain‐compensated InAs quantum dot ensemble. We observed the non‐harmonic oscillations of the ensemble averaged four‐wave mixing signal intensities measured as a function of the averaged pulse area of an excitation pulse. The experimental results can be well reproduced by calculations considering the effect of the inhomogeneities of the detuning, the transition dipole moment, and the electric field amplitude without any fitting parameters.

DOI
10.1063/1.3666456

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Abstract We observed excitonic Rabi oscillations (ROs) in quantum dots (QDs) by four‐wave mixing (FWM) and pump‐probe techniques. When a large number of QDs are excited by a spatially nonuniform laser, the inhomogeneous distribution of the transition dipole moments of the QD excitons and the spatial distribution of the input electric field induce distribution of the Rabi frequencies. We investigated this ensemble effect on the ROs of the excitonic polarization and the excitonic population observed in the FWM and pump‐probe signals. By calculating the FWM and pump‐probe signals including the Gaussian distribution of the pulse area, we first showed that a part of the ensemble effect can be cancelled out only in case of the ROs of the excitonic polarization. This reflects the differences between the characteristics of excitonic polarization and population. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Abstract We report the excitonic Rabi oscillations in self assembled quantum dots observed by photon echo spectroscopy. The amplitude of the observed Rabi oscillations increases with the pulse area, which is different from the results of previous reports. A numerical calculation of the Rabi oscillations including the local field effect in a quantum dot well reproduces the experimental oscillations, indicating that the local field effect is one of the important origins of the modification of the Rabi oscillations in quantum dots (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)