Coherent exciton delocalization in strongly coupled quantum dot arrays.
basic_science · Level V
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- Record sourced from PubMed, PMID 24041088.
- Also identified by DOI 10.1021/nl402725m.
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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.
Medical subject headings
- Cadmium Compounds
- Optics and Photonics
- Quantum Dots
- Selenium Compounds