Using two-dimensional photon echo spectroscopy to probe the fine structure of the ground state biexciton of CdSe nanocrystals

Cathy Y. Wong, Gregory D. Scholes

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

The origin of the fine structure of the ground state single- and biexciton of CdSe nanocrystals is reviewed, along with the theoretical framework used to describe these states. Calculations were performed to determine the transition dipole moments of optically allowed transitions from the single- to biexciton fine structure states. Two-dimensional photon echo spectroscopy measurements for a sample of CdSe nanocrystals are reported. The two-dimensional electronic spectrum at a population time of 0 fs is analyzed using a simulation based on k.p theory predictions of the exciton and biexciton manifolds of states. The analysis suggests that a particular excited state absorption transition from the single- to biexciton fine structure dominates the 2D spectra. These excited state absorptions are clearly resolved in 2D spectra and the method therefore has promise for gaining clearer insights into quantum dot spectroscopy.

Original languageEnglish (US)
Pages (from-to)366-374
Number of pages9
JournalJournal of Luminescence
Volume131
Issue number3
DOIs
StatePublished - Mar 1 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

Keywords

  • Band edge exciton
  • Biexcitons
  • Exciton fine structure
  • Quantum dots
  • Semiconductor nanocrystals
  • Two-dimensional electronic spectroscopy

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