Environmental noise tends to have a detrimental effect on processes that rely on exciton coherence. To assess the role that noise may play in our system, we applied Redfield theory to simulate the behavior of the dimer system when it is weakly coupled to a bath. Following the equations outlined in Sec. S4.1, we choose parameters for the Redfield equation within a range observed typically for organic chromophores systems at 300K. For the bath spectral density (Eq. S17) we set λ = 100 cm -1 and Ω c to be proportional to λ by 2λ/(βΩ 2 c ) = 1.2. A B