1,071 research outputs found
Role of Quantum Coherence and Energetic Disorder on Exciton Transport in Polymer Films
The cross-over from coherent to incoherent exciton transport in disordered
polymer films is studied by computationally solving a modified form of the
Redfield equation for the exciton density matrix. This theory models quantum
mechanical (ballistic) and incoherent (diffusive) transport as limiting cases.
It also reproduces Forster transport for certain parameter regimes. Using model
parameters appropriate to polymer thin films it is shown that short-time
quantum mechanical coherence increases the exciton diffusion length. It also
causes rapid initial energy relaxation and larger line widths. The route to
equilibrium is, however, more questionable, as the equilibrium populations of
the model do not satisfy the Boltzmann distributions over the site energies.
The Redfield equation for the dimer is solved exactly to provide insight into
the numerical results.Comment: Accepted for publication in Phys. Rev. B. (July 2006). 19 pages and 8
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The oral poetics of professional wrestling, or laying the smackdown on Homer
In this paper I offer up one such genre for analysis --professional wrestling--and show that interpreting the tropes of wrestling through the lens of composition in performance provides information that, in return, can help with analysis of materials more commonly addressed by this theory
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Evaluation of sludge, composted sludge, and fly ash for the growth of turf and container plants.
A survey of boxing laws of the forty-eight states as applied to high schools
Thesis (M.A.)--Boston University, 1947. This item was digitized by the Internet Archive
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