Multiexcitons confined within a subexcitonic volume

Spectroscopic and dynamical signatures of neutral and charged biexcitons in ultrasmall semiconductor nanocrystals

M. Achermann, J. A. Hollingsworth, Victor I Klimov

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160 Citations (Scopus)

Abstract

The use of ultrafast gating techniques allows us to resolve both spectrally and temporally the emission from short-lived neutral and negatively charged biexcitons in ultrasmall (sub-10 nm) CdSe nanocrystals (nanocrystal quantum dots). Because of "forced" overlap of electronic wave functions and reduced dielectric screening, these states are characterized by giant interaction energies of tens (neutral biexcitons) to hundreds (charged biexcitons) of meV. Both types of biexcitons show extremely short lifetimes (from sub-100 picoseconds to sub-picosecond time scales) that rapidly shorten with decreasing nanocrystal size. These ultrafast relaxation dynamics are explained in terms of highly efficient nonradiative Auger recombination.

Original languageEnglish
Article number245302
Pages (from-to)2453021-2453025
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number24
Publication statusPublished - Dec 2003

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Nanocrystals
nanocrystals
signatures
Semiconductor materials
Wave functions
Semiconductor quantum dots
Screening
screening
quantum dots
wave functions
life (durability)
electronics
interactions
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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AB - The use of ultrafast gating techniques allows us to resolve both spectrally and temporally the emission from short-lived neutral and negatively charged biexcitons in ultrasmall (sub-10 nm) CdSe nanocrystals (nanocrystal quantum dots). Because of "forced" overlap of electronic wave functions and reduced dielectric screening, these states are characterized by giant interaction energies of tens (neutral biexcitons) to hundreds (charged biexcitons) of meV. Both types of biexcitons show extremely short lifetimes (from sub-100 picoseconds to sub-picosecond time scales) that rapidly shorten with decreasing nanocrystal size. These ultrafast relaxation dynamics are explained in terms of highly efficient nonradiative Auger recombination.

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