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Ensemble effect on Rabi oscillations of excitons in quantum dots
Author(s) -
Kujiraoka Mamiko,
IshiHayase Junko,
Akahane Kouichi,
Yamamoto Naokatsu,
Ema Kazuhiro,
Sasaki Masahide
Publication year - 2009
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200881307
Subject(s) - rabi frequency , rabi cycle , quantum dot , excited state , quantum beats , polarization (electrochemistry) , dipole , population , exciton , physics , atomic physics , condensed matter physics , quantum , laser , chemistry , quantum mechanics , demography , sociology
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)