Observation of an Excitonic Quantum Coherence in CdSe Nanocrystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 26359970.
- Also identified by DOI 10.1021/acs.nanolett.5b02786.
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Abstract
Recent observations of excitonic coherences within photosynthetic complexes suggest that quantum coherences could enhance biological light harvesting efficiencies. Here, we employ optical pump-probe spectroscopy with few-femtosecond pulses to observe an excitonic quantum coherence in CdSe nanocrystals, a prototypical artificial light harvesting system. This coherence, which encodes the high-speed migration of charge over nanometer length scales, is also found to markedly alter the displacement amplitudes of phonons, signaling dynamics in the non-Born-Oppenheimer regime.