Ensemble effect on Rabi oscillations of excitons in quantum dots

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

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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 languageEnglish
Pages (from-to)952-955
Number of pages4
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume206
Issue number5
DOIs
Publication statusPublished - 2009 May 1
Externally publishedYes

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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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