# Two-dimensional electronic spectra of the photosynthetic apparatus of green sulfur bacteria

## TL;DR

This paper presents a theoretical model for the two-dimensional electronic spectra of green sulfur bacteria's photosynthetic apparatus, elucidating energy transfer mechanisms and environmental interactions.

## Contribution

It introduces a novel model calculation that accurately reproduces experimental spectra and transfer times, revealing environment-assisted transport as key to energy transfer.

## Key findings

- Model matches experimental spectral features and transfer times
- Identifies environment-assisted transport as crucial for energy transfer
- Infers coupling strengths between chlorosome, FMO complex, and environment

## Abstract

Advances in time resolved spectroscopy have provided new insight into the energy transmission in natural photosynthetic complexes. Novel theoretical tools and models are being developed in order to explain the experimental results. We provide a model calculation for the two-dimensional electronic spectra of Cholorobaculum tepidum which correctly describes the main features and transfer time scales found in recent experiments. From our calculation one can infer the coupling of the antenna chlorosome with the environment and the coupling between the chlorosome and the Fenna-Matthews-Olson complex. We show that environment assisted transport between the subunits is the required mechanism to reproduce the experimental two-dimensional electronic spectra.