title: Correlation-dependent coherent to incoherent transitions in resonant energy transfer dynamics.
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 multiphonon 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.
authors.affiliation: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom. ahsan.nazir@ucl.ac.uk
authors.forename: Ahsan
authors.initials: A
authors.lastname: Nazir