Effect of disorder and polarization sequences on two-dimensional spectra of light harvesting complexes

TL;DR

This paper uses theoretical calculations to explore how disorder and polarization sequences influence two-dimensional spectra in light-harvesting complexes, aiding interpretation of complex experimental data.

Contribution

It provides a detailed analysis of how rotational and conformational disorder affect 2DES in the Fenna-Matthews-Olson complex, enhancing understanding of spectral features.

Findings

Disorder significantly alters 2DES signals.

Polarization sequences can help disentangle spectral features.

Theoretical insights improve interpretation of experimental spectra.

Abstract

Two-dimensional electronic spectra (2DES) provide unique ways to track the energy transfer dynamics in light-harvesting complexes. The interpretation of the peaks and structures found in experimentally recorded 2DES is often not straightforward, since several processes are imaged simultaneously. The choice of specific pulse polarization sequences helps to disentangle the sometimes convoluted spectra, but brings along other disturbances. We show by detailed theoretical calculations how 2DES of the Fenna-Matthews-Olson complex are affected by rotational and conformational disorder of the chromophores.