The extended star graph as a light-harvesting-complex prototype: excitonic absorption speedup by peripheral energy defect tuning

TL;DR

This study investigates how peripheral energy defects in an extended star network can optimize excitonic absorption speed, revealing a tunable defect value and structural conditions that enhance photo-excitation efficiency.

Contribution

It introduces a novel understanding of how peripheral defect tuning and network architecture influence excitonic absorption speedup in star-like quantum networks.

Findings

Optimal energy defect value enhances absorption speed.

Speedup occurs when branch length is below a critical threshold.

Hybridization of excitonic states explains the speedup mechanism.

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 $\Delta$. Our numerical simulations reveal the existence of optimal value of energy defect $\Delta^*$ 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 $L_B \leq L_B^*$ with $L_B^* \approx 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 $L_B \leq L_B^*$ 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.