# Beating maps of singlet fission: Full-quantum simulation of coherent two-dimensional electronic spectroscopy in organic aggregates

## TL;DR

This paper presents a full-quantum simulation of 2D electronic spectra in organic aggregates to understand singlet fission, revealing triplet signals and the role of charge-transfer states with implications for experimental interpretation.

## Contribution

It introduces a full-quantum dynamical approach using the Davydov ansatz to simulate 2D spectra and analyze triplet excitation signals in singlet fission, clarifying transition pathways.

## Key findings

- Triplet excitation signals are identified in 2D spectra.
- Increasing charge-transfer state energy inhibits triplet beating signals.
- Signals related to triplet excitations are explicitly observed in beating maps.

## Abstract

The coherent two-dimensional (2D) electronic spectra with respect to the singlet fission (SF) process in organic molecular aggregates are simulated by the Davydov ansatz combined with the Frenkel-Dirac time-dependent variational algorithm. By virtue of the full-quantum dynamical approach, we are able to identify the signals of triplet excitation in the excite-state absorption contribution of the 2D spectra. In order to discuss whether a mediative charge-transfer (CT) state is necessary to SF, we increase the CT-state energy and find, in a theoretical manner, the beating signal related to the triplet is inhibited. The vibronic coherence is then studied in the beating maps for both the ground and excited state. Except for the normal beating modes adhering to the relevant electronic state, we observe signals that are explicitly related to the triplet excitations. The pathways of transition corresponding to these signals are clarified in the respective Feynman diagram, which can help the experimenters determine the physical origin of relevant measurements.