Spontaneous Spectral Diffusion in CdSe Quantum Dots

Mark J. Fernee*, Taras Plakhotnik, Yann Louyer, Bradley N. Littleton, Christian Potzner, Philippe Tamarat, Paul Mulvaney, Brahim Lounis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

Spectral diffusion of the emission line of single colloidal nanocrystals is generally regarded as a random process. Here, we show that each new spectral position has a finite memory of previous spectral positions, as evidenced by persistent anticorrelations in time series of spectral jumps. The anticorrelation indicates that there is an enhanced probability of the charge distribution around the nanocrystal returning to a previous configuration. We show both statistically and directly that this memory manifests as an observable spontaneous "relaxation" in the absence of a pump laser, so that spectral diffusion progresses in a manner of "two steps forward and one step back".

Original languageEnglish
Article numberN/A
Pages (from-to)1716-1720
Number of pages5
JournalJournal of physical chemistry letters
Volume3
Issue number12
DOIs
Publication statusPublished - 21 Jun 2012

Keywords

  • SEMICONDUCTOR NANOCRYSTALS
  • SURFACE TRAPS
  • SINGLE
  • INTERMITTENCY
  • SPECTROSCOPY
  • BLINKING
  • EMISSION

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