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Updated: Jun 11, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Extracting single and two-exciton couplings in photosynthetic complexes by coherent two-dimensional electronic
Darius Abramavicius1, Benoit Palmieri, Shaul Mukamel
1University of California Irvine, California, United States.
Abstract:
Signatures of "strong" J and "weak" K exciton couplings in the nonlinear femtosecond optical response of the FMO photosynthetic complex are identified. The two types of couplings originate from interactions of molecular transition charge dipoles and change of molecular permanent dipoles in their ground and excited states, respectively. We demonstrate that by combining various two-dimensional optical signals it should be possible to invert spectroscopic data to reconstruct the full exciton Hamiltonian (energies and couplings).
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