Dephasing processes in II–VI quantum dots

U. Woggon, M. Portuné, C. Klingshirn, H. Giessen, B. Fluegel, G. Mohs, N. Peyghambarian

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The loss of phase coherence in II–VI quantum dots is investigated using experimental methods working both in the frequency and in the time domain. Femtosecond differential absorption experiments reveal narrow resonances at very early times after excitation and low excitation densities for CdSe quantum dots. A substructure is detected and explained by transitions from the series of confined hole states. By nondegenerate four‐wave mixing experiments (NDFWM) the dephasing time is determined for CdS quantum dots with radii larger than the Bohr radius. Temperature and excitation intensity dependent dephasing times between ≈ 20 fs and some 100 fs are measured and attributed to electron‐hole pair–phonon coupling and carrier–carrier scattering.

Original languageEnglish (US)
Pages (from-to)221-227
Number of pages7
Journalphysica status solidi (b)
Volume188
Issue number1
DOIs
StatePublished - Mar 1 1995

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Woggon, U., Portuné, M., Klingshirn, C., Giessen, H., Fluegel, B., Mohs, G., & Peyghambarian, N. (1995). Dephasing processes in II–VI quantum dots. physica status solidi (b), 188(1), 221-227. https://doi.org/10.1002/pssb.2221880119