Abstract
We study the quantum dynamics of a photo-excitation uniformly distributed at the periphery of an extended star network (with N_B branches of length L_B). More specifically, we address here the question of the energy absorption at the core of the network and how this process can be improved (or not) by the inclusion of peripheral defects with a tunable energy amplitude Δ. Our numerical simulations reveal the existence of optimal value of energy defect Δ^* which depends on the network architecture. Around this value, the absorption process presents a strong speedup (i.e. reduction of the absorption time) provided that L_B ≤ L_B^* with L_B^* ≈ 12.5/ln(N_B) . Analytical/numerical developments are then conducted to interpret this feature. We show that the origin of this speedup takes place in the hybridization of two upper-band excitonic eigenstates. This hybridization is important when L_B ≤ L_B^* and vanishes almost totally when L_B > L_B^*. These structural rules we draw here could represent a potential guide for the practical design of molecular nano-network dedicated to the realisation of efficient photo-excitation absorption.