Observation of enhanced biexcitonic effect in semiconductor nanocrystals

Seung Han Park, Young Nam Hwang, Dongho Kim, Koo Chul Je

Research output: Contribution to journalArticle

Abstract

We have observed enhanced biexcitonic effect in (formula presented) nanocrystals by means of femtosecond two-photon pump-probe spectroscopy. In contrast to a weak biexcitonic photoinduced absorption in the presence of (formula presented) or (formula presented) excitons due to one-photon excitation, we have found a pronounced photoinduced absorption arising from a strong Coulomb coupling between a (formula presented) exciton and a two-photon excited (formula presented) exciton. We have also theoretically shown that (formula presented) biexcitons have a large binding energy compared with (formula presented) and (formula presented) biexciton states.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number4
DOIs
Publication statusPublished - 2001 Jan 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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