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Intramolecular vibrations enhance exciton coherence in light-harvesting systems. However, non-classical correlations in vibrational modes arise from coherent laser preparation, not natural sunlight.

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Area of Science:

  • Quantum biology
  • Spectroscopy
  • Photochemistry

Background:

  • Long-lived coherences in light-harvesting complexes are crucial for efficient energy transfer.
  • Intramolecular vibrational modes play a key role in interpreting these coherences.

Purpose of the Study:

  • To analyze the relevance of intramolecular vibrations for light-harvesting vibronic prototype dimers under incoherent (sun)light.
  • To investigate the origin of non-classical correlations in vibrational modes.

Main Methods:

  • Density matrix dynamics simulation.
  • Analysis of vibrational mode evolution under different light sources (incoherent vs. coherent).

Main Results:

  • Inclusion of intramolecular vibrations reinforces exciton coherence by an order of magnitude.
  • Coherent laser preparation, not incoherent sunlight, induces non-classical correlations in vibrational modes.

Conclusions:

  • Intramolecular vibrations significantly enhance exciton coherence in light-harvesting systems.
  • Non-classical vibrational correlations are an artifact of coherent laser excitation, not inherent to natural processes.