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Exciton Seebeck effect in molecular systems.

Yun-An Yan1, Shaohong Cai2

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Temperature differences redistribute exciton populations and alter transfer times in molecular aggregates. This exciton Seebeck effect can be mimicked by adjusting site energies, offering new control mechanisms.

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Area of Science:

  • Quantum dynamics
  • Photochemistry
  • Condensed matter physics

Background:

  • Exciton dynamics govern energy transfer in molecular systems.
  • Temperature gradients can influence quantum phenomena.
  • Understanding exciton behavior under thermal stress is crucial for energy applications.

Purpose of the Study:

  • To investigate exciton dynamics influenced by temperature differences.
  • To explore the relationship between temperature gradients and exciton transfer.
  • To introduce and characterize the 'exciton Seebeck effect'.

Main Methods:

  • Utilizing hierarchical equations of motion for nonperturbative simulations.
  • Modeling transient absorption spectra of a heterogeneous trimer system.
  • Analyzing exciton population redistribution and transfer times.

Main Results:

  • Temperature differences induce significant exciton population redistribution.
  • Exciton transfer times are demonstrably affected by temperature gradients.
  • Site energy tuning can effectively replicate temperature-induced effects.

Conclusions:

  • A site energy shift equivalence exists for temperature differences, analogous to the Seebeck effect.
  • The 'exciton Seebeck effect' provides a new perspective on thermal influence in excitonic systems.
  • This finding offers potential for controlling energy transfer through thermal gradients.