Exciton superposition states in CdSe nanocrystals measured using broadband two-dimensional electronic spectroscopy

Daniel Turner, Yasser Hassan, Gregory D. Scholes

Research output: Contribution to journalArticle

Abstract

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 lowest-energy 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.

Original languageEnglish (US)
Pages (from-to)880-886
Number of pages7
JournalNano Letters
Volume12
Issue number2
DOIs
StatePublished - Feb 8 2012

Fingerprint

Quantum computers
Photosynthesis
Excitons
Nanocrystals
nanocrystals
excitons
Spectroscopy
broadband
photosynthesis
Electrons
quantum computation
electronics
spectroscopy
eigenvectors
signatures
Temperature
room temperature
simulation
LDS 751
energy

Keywords

  • electron-phonon coupling
  • electronic coherence
  • femtosecond dynamics
  • nanocrystals
  • quantum dots
  • Two-dimensional spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Exciton superposition states in CdSe nanocrystals measured using broadband two-dimensional electronic spectroscopy. / Turner, Daniel; Hassan, Yasser; Scholes, Gregory D.

In: Nano Letters, Vol. 12, No. 2, 08.02.2012, p. 880-886.

Research output: Contribution to journalArticle

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