Radiatively limited dephasing of quantum dot excitons in the telecommunications wavelength range

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

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22 Citations (Scopus)

Abstract

The extremely long dephasing time of excitons in strain-compensated quantum dots at telecommunications wavelengths was measured using a polarization-dependent four-wave mixing technique. The use of a 150-layer-stacked structure enabled them to measure a four-wave mixing signal with a high signal-to-noise ratio, in spite of the fact that a high-sensitive heterodyne detection was not used. The large anisotropy of the dephasing time indicates the dominance of the radiative recombination process on dephasing. By simultaneously measuring the radiative lifetime using a pump-probe technique, they could directly estimate pure dephasing with an accuracy of better than 0.1 μeV.

Original languageEnglish
Article number103111
JournalApplied Physics Letters
Volume91
Issue number10
DOIs
Publication statusPublished - 2007 Sep 13
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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