Control of excitation energy transfer in molecular systems by Floquet engineering.
Excitation energy transfer (EET) is one of the most important processes in both natural and artificial chemical systems including, for example, photosynthetic complexes and organic solar cells. The EET rate, however, is exponentially suppressed when there is a large difference in the excitation energy between the donor and acceptor molecules. Here we show both analytically and numerically that the EET rate can be strongly enhanced by periodically modulating the excitation energy of one molecule via a driven oscillating charged particle that is trapped in close proximity to the molecule. Using the so-called Floquet-engineering, where the system's Hamiltonian is periodically modulated, the enhancement of EET turns out to be robust even in the presence of fluctuations and dissipations induced by the coupling with a huge number of dynamic degrees of freedom in the surrounding molecular environments.
Publisher URL: http://arxiv.org/abs/1801.02813