Interaction between excitons determines the non-linear response of nanocrystals

Mayrose R. Salvador, P. Sreekumari Nair, Minhaeng Cho, Gregory D. Scholes

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The non-linear response of semiconductor quantum dots is investigated using three-pulse photon echo peak shift (3PEPS) experiments and simulations. The third-order non-linear response is modeled by a three-level system, utilizing Brownian oscillators to model the line-broadening functions. Our results show that biexciton formation and exciton-exciton scattering significantly influence the non-linear response of quantum dots. The exciton to biexciton excited state absorption pathways are also investigated for quantum dots with different crystal structures. Our calculations suggest that the probability of excited state absorption to the biexcitonic state is higher for zinc-blende structured nanocrystals.

Original languageEnglish
Pages (from-to)56-68
Number of pages13
JournalChemical Physics
Volume350
Issue number1-3
DOIs
Publication statusPublished - 2008 Jun 23

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Keywords

  • CdSe
  • Laser
  • Nanocrystal
  • Non-linear response
  • Photo echo
  • Quantum dot
  • Ultrafast

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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