Nonlinear optical approach to multiexciton relaxation dynamics in quantum dots

Vanessa Margaret Huxter, Gregory D. Scholes

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Unlike the majority of molecular systems quantum dots can accommodate multiple excitations, which is a particularly important attribute for potential lasing applications. We demonstrate in this work the concept of using nth order nonlinear spectroscopies in the transient grating configuration as a means of selectively exciting (n-1) 2 excitons in a semiconductor and probing the subsequent relaxation dynamics. We report a direct observation of multiparticle dynamics on ultrashort time scales through comparison of third and fifth order experiments for CdSe colloidal quantum dots. Time constants associated with multiexciton recombination and depopulation dynamics are reported. Deviation from a Poisson model for the distribution of photoexcited excitons, biexcitons, and triexcitons is also discussed.

Original languageEnglish (US)
Article number144716
JournalThe Journal of Chemical Physics
Volume125
Issue number14
DOIs
StatePublished - 2006
Externally publishedYes

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Semiconductor quantum dots
quantum dots
excitons
time constant
lasing
Spectroscopy
gratings
Semiconductor materials
deviation
configurations
spectroscopy
excitation
Experiments
LDS 751

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Nonlinear optical approach to multiexciton relaxation dynamics in quantum dots. / Huxter, Vanessa Margaret; Scholes, Gregory D.

In: The Journal of Chemical Physics, Vol. 125, No. 14, 144716, 2006.

Research output: Contribution to journalArticle

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