Ensemble effect on Rabi oscillations of excitons in quantum dots

Mamiko Kujiraoka; Junko Ishi-Hayase; Kouichi Akahane; Naokatsu Yamamoto; Kazuhiro Ema; Masahide Sasaki

doi:10.1002/pssa.200881307

Ensemble effect on Rabi oscillations of excitons in quantum dots

Mamiko Kujiraoka, Junko Ishi-Hayase, Kouichi Akahane, Naokatsu Yamamoto, Kazuhiro Ema, Masahide Sasaki

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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 spa-tial 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 dif-ferences between the characteristics of excitonic polarization and population.

Original language	English
Pages (from-to)	952-955
Number of pages	4
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	206
Issue number	5
DOIs	https://doi.org/10.1002/pssa.200881307
Publication status	Published - 2009 May 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Electrical and Electronic Engineering
Materials Chemistry

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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 spa-tial 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 dif-ferences between the characteristics of excitonic polarization and population.",

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AU - Kujiraoka, Mamiko

AU - Ishi-Hayase, Junko

AU - Akahane, Kouichi

AU - Yamamoto, Naokatsu

AU - Ema, Kazuhiro

AU - Sasaki, Masahide

PY - 2009/5/1

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N2 - 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 spa-tial 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 dif-ferences between the characteristics of excitonic polarization and population.

AB - 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 spa-tial 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 dif-ferences between the characteristics of excitonic polarization and population.

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