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We study using the Bethe-Salpeter formalism the excitation energies of thezincbacteriochlorinbacteriochlorin dyad, a paradigmatic photosynthetic complex.In great contrast with standard timedependent density functional theorycalculations with (semi)local kernels, charge transfer excitations arecorrectly located above the intramolecular Q-bands transitions found to be inexcellent agreement with experiment. Further, the asymptotic Coulomb behaviortowards the true quasiparticle gap for charge transfer excitations at longdistance is correctly reproduced, showing that the present scheme allows tostudy with the same accuracy intramolecular and charge transfer excitations atvarious spatial range and screening environment without any adjustableparameter.

Short to long-range charge-transfer excitations in the zincbacteriochlorin-bacteriochlorin complex: a Bethe-Salpeter study