Journal
NANO LETTERS
Volume 12, Issue 2, Pages 880-886Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2039502
Keywords
Two-dimensional spectroscopy; quantum dots; electronic coherence; electron-phonon coupling; femtosecond dynamics; nanocrystals
Categories
Funding
- United States Air Force Office of Scientific Research [FA9550-10-1-0260]
- Natural Sciences and Engineering Research Council of Canada
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Coherent superpositions among eigenstates are of interest in fields as diverse as photosynthesis and quantum computation. In this report, we used two-dimensional electronic spectroscopy (2D ES) to measure the decoherence time of a superposition of the two lowestenergy excitons in colloidal CdSe nanocrystals (cubic phase) in solution at room temperature. In the electron-hole representation, the quantum coherence is, remarkably, a twelve-particle correlation. By comparing the measured 2D ES to simulations, we also explored the effects of inhomogeneous broadening and examined the spectroscopic signatures of biexcitons.
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