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Related Experiment Videos

Aging correlation functions for blinking nanocrystals, and other on-off stochastic processes.

G Margolin1, E Barkai

  • 1Department of Chemistry and Biochemistry, Notre Dame University, Notre Dame, Indiana 46556, USA.

The Journal of Chemical Physics
|July 21, 2004
PubMed
Summary

This study models nanocrystal blinking using a two-state system, revealing aging behavior in intensity correlations. The findings classify different blinking dynamics relevant to experimental observations.

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Area of Science:

  • Nanoscience
  • Physical Chemistry
  • Chemical Physics

Background:

  • Single nanocrystal blinking exhibits power-law dynamics.
  • Intensity correlation functions are crucial for understanding dynamic processes.

Purpose of the Study:

  • To calculate two-time intensity correlation functions for nanocrystal blinking.
  • To classify aging behaviors in these correlation functions.
  • To connect blinking dynamics to underlying stochastic models.

Main Methods:

  • Utilized a two-state (on/off) stochastic model for nanocrystal dynamics.
  • Calculated two-time intensity correlation functions I(t)I(t+t').
  • Analyzed asymptotic scaling behaviors in the double time domain.

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Main Results:

  • Identified four classes of scaling behaviors for intensity correlations.
  • Demonstrated aging behavior for distributions relevant to experiments.
  • Linked aging to power-law and exponential distributions of on/off times.

Conclusions:

  • Aging in nanocrystal blinking is explained by a simple diffusion model.
  • Diffusion-controlled reactions at the single-particle level exhibit aging.
  • The study provides a framework for interpreting experimental blinking data.