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(a) The energy levels of the exciton-collective mode states used to describe energy transfer 
. The red arrow denotes population transfer from 
to 
. (b) Quantum coherent dynamics of the PEB50 dimer in PE545 illustrating population of the lowest exciton ρYY(t) (thick blue curve) and the inter-exciton coherence in the ground-state of the collective mode |ρX0−Y0(t)| (thin red curve).
