Selection of dominant multi-exciton transitions in disordered linear J-aggregates

TL;DR

This paper demonstrates that the third-order optical response of disordered linear J-aggregates can be accurately approximated by considering only a select subset of exciton transitions, simplifying calculations.

Contribution

It introduces a method to efficiently compute the optical response by truncating the transition set, reducing computational complexity while maintaining accuracy.

Findings

Truncated transition set yields accurate pump-probe spectra.

Approximation is valid except for the blue wing of the absorption peak.

Method simplifies analysis of disordered J-aggregates.

Abstract

We show that the third-order optical response of disordered linear J-aggregates can be calculated by considering only a limited number of transitions between (multi-) exciton states. We calculate the pump-probe absorption spectrum resulting from the truncated set of transitions and show that, apart from the blue wing of the induced absorption peak, it agrees well with the exact spectrum.