Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays

Ryan W. Crisp, Joel N. Schrauben, Matthew C. Beard, Joseph M. Luther, Justin C. Johnson

Research output: Contribution to journalArticlepeer-review

58 Scopus Citations

Abstract

Quantum dots (QDs) coupled into disordered arrays have exhibited the intriguing property of bulk-like transport while maintaining discrete excitonic optical transitions. We have utilized ultrafast cross-polarized transient grating (CPTG) spectroscopy to measure electron-hole wave function overlap in CdSe QD films with chemically modified surfaces for tuning inter-QD electronic coupling. By comparing the CPTG decays with those of isolated QDs, we find that excitons coherently delocalize to form excited states more than 200% larger than the QD diameter.

Original languageAmerican English
Pages (from-to)4862-4869
Number of pages8
JournalNano Letters
Volume13
Issue number10
DOIs
StatePublished - 2013

NREL Publication Number

  • NREL/JA-5900-60817

Keywords

  • delocalization
  • exciton
  • nonlinear
  • Quantum dot
  • spin
  • ultrafast

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