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Excitation energy transfer (EET) is one of the most important processes inboth natural and artificial chemical systems including, for example,photosynthetic complexes and organic solar cells. The EET rate, however, isstrongly suppressed when there is a large difference in the excitation energybetween the donor and acceptor molecules. Here, we demonstrate bothanalytically and numerically that the EET rate can be greatly enhanced byperiodically modulating the excitation energy difference. The enhancement ofEET by using this Floquet engineering, in which the system's Hamiltonian ismade periodically time-dependent, turns out to be efficient even in thepresence of strong fluctuations and dissipations induced by the coupling with ahuge number of dynamic degrees of freedom in the surrounding molecularenvironments. As an effect of the environment on the Floquet engineering ofEET, the optimal driving frequency is found to depend on the relativemagnitudes of the system and environment's characteristic time scales with anobserved frequency shift when moving from the limit of slow environmentalfluctuations (inhomogeneous broadening limit) to that of fast fluctuations(homogeneous broadening limit).

Control of Excitation Energy Transfer in Condensed Phase Molecular Systems by Floquet Engineering