Correlation-dependent coherent to incoherent transitions in resonant energy transfer dynamics
arXiv:0906.0592 · doi:10.1103/PhysRevLett.103.146404
Abstract
I investigate energy transfer in a donor-acceptor pair beyond weak system-bath coupling. I identify a transition from coherent to incoherent dynamics with increasing temperature, due to multi-phonon effects not captured by a standard weak-coupling treatment. The crossover temperature has a marked dependence on the degree of spatial correlation between fluctuations experienced at the two system sites. For strong correlations, this leads to the possibility of coherence surviving into a high temperature regime.
5 pages, 1 figure, 2 page supplement. Published version. Figure edited, section added on experimental relevance, reference added, various minor changes to the text. Comments welcome