title: Disentangling the effects of clustering and multi-exciton emission in second-order photon correlation experiments.
abstract: In single particle spectroscopy, the degree of observed fluorescence anti-bunching in a second-order cross correlation experiment is indicative of its bi-exciton quantum yield and whether or not a particle is well isolated. Advances in quantum dot synthesis have produced single particles with bi-exciton quantum yields approaching unity. Consequently, this creates uncertainty as to whether a particle has a high bi-exciton quantum yield or if it exists as a cluster. We report on a time-gated anti-bunching technique capable of determining the relative contributions of both multi-exciton emission and clustering effects. In this way, we can now unambiguously determine if a particle is single. Additionally, this time-gated anti-bunching approach provides an accurate way for the determination of bi-exciton lifetime with minimal contribution from higher order multi-exciton states.
authors.affiliation: Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. ben.mangum@pacificlighttech.com
authors.forename: Benjamin D
authors.initials: BD
authors.lastname: Mangum
authors.forename: Yagnaseni
authors.initials: Y
authors.lastname: Ghosh
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Hollingsworth
authors.forename: Han
authors.initials: H
authors.lastname: Htoon
mesh_terms: D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D010783:Photometry / Q000379:methods*; D017785:Photons; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence / Q000379:methods*
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