Coherent dynamics of excitons in a stack of self-assembled InAs quantum dots at 1.5-μm waveband

J. Ishi-Hayase, K. Akahane, N. Yamamoto, M. Kujiraoka, J. Inoue, K. Ema, M. Tsuchiya, M. Sasaki

研究成果: Article査読

9 被引用数 (Scopus)

抄録

We investigate the excitonic dephasing in a stack of self-assembled quantum dots (SAQDs) by using a four-wave-mixing (FWM) technique performed in the optical telecomm-fiber wavelength region at 6 K. A sample used in our experiment is a 150-layer stack of InAs SAQDs embedded in InGaAlAs grown on InP(3 1 1)B substrate fabricated by molecular beam epitaxy. By using a novel strain-controlled technique, the resonant wavelength of the exciton ground state (GS) ranges from 1.25 to 1.5 μm which is much longer than that in typical In(Ga)As SAQDs. In the weak excitation region, the intrinsic dephasing time of excitons at the excitation wavelength of 1.43 μm reaches 770 ps which is much longer than that in most SAQDs with the resonant wavelength of <1 μm. We also find a strong anisotoropy of the signal intensity with respect to the crystal axis attributed to the orientation of InP(3 1 1)B substrate and the elongated shape of QDs.

本文言語English
ページ(範囲)318-322
ページ数5
ジャーナルJournal of Luminescence
119-120
SPEC. ISS.
DOI
出版ステータスPublished - 2006 7月
外部発表はい

ASJC Scopus subject areas

  • 生物理学
  • 生化学
  • 化学 (全般)
  • 原子分子物理学および光学
  • 凝縮系物理学

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