Charged and neutral biexcitonexciton cascade in a single quantum dot within a photonic bandgap

M. Shirane, Y. Igarashi, Y. Ota, M. Nomura, N. Kumagai, S. Ohkouchi, A. Kirihara, S. Ishida, S. Iwamoto, S. Yorozu, Y. Arakawa

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We investigate the recombination dynamics of positively charged and neutral biexcitons and excitons in a single InAs/GaAs quantum dot (QD) within a two-dimensional (2D) photonic bandgap (PBG). The 2D PBG makes the exciton lifetime four times longer and enhances photon-extraction efficiency compared to those without the PBG. Photon cross-correlation measurements demonstrate the cascade emissions of both charged and neutral biexcitonsexcitons from the same QD. In the charged case, a hole in the p-shell relaxes into the s-shell between the cascade, and the corresponding transition is confirmed based on the spin configuration. The long exciton lifetime with the PBG helps us to reveal the spin dynamics that did not clearly appear in intrinsic QDs.

Original languageEnglish
Pages (from-to)2563-2566
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number10
DOIs
Publication statusPublished - 2010 Sep
Externally publishedYes

Keywords

  • Biexcitons
  • Charged excitons
  • Gallium arsenide
  • IIIV semiconductors
  • Indium compounds
  • Photon correlation spectroscopy
  • Photonic bandgap
  • Semiconductor quantum dots

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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