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Modeling molecular J and H aggregates using multiple-Davydov D2 ansatz.

Mantas Jakučionis1, Agnius Žukas1, Darius Abramavičius1

  • 1Institute of Chemical Physics, Vilnius University, Sauletekio Ave. 9-III, LT-10222 Vilnius, Lithuania.

Physical Chemistry Chemical Physics : PCCP
|July 14, 2022
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Summary

The multi-Davydov D2 (mD2) wavefunction is essential for accurately modeling molecular aggregate absorption spectra, outperforming the standard Davydov D2 approach across various conditions. This study details its necessity and explores aggregate wavepacket dynamics.

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Area of Science:

  • * Quantum mechanics and condensed matter physics.
  • * Spectroscopy and photochemistry of molecular aggregates.

Background:

  • * Understanding the optical properties of molecular aggregates is crucial for designing advanced materials.
  • * Previous models often simplified the complex electronic and vibrational interactions within aggregates.

Purpose of the Study:

  • * To investigate the linear absorption spectra of J and H molecular aggregates.
  • * To determine the necessity of the multi-Davydov D2 (mD2) wavefunction for accurate spectral modeling.
  • * To explore the relationship between model parameters and the mD2 Ansatz depth.

Main Methods:

  • * Application of the time-dependent Dirac-Frenkel variational principle (TDVP).
  • * Utilizing the multi-Davydov D2 (mD2) trial wavefunction (Ansatz).
  • * Considering both electronic and vibrational molecular degrees of freedom (DOF).

Main Results:

  • * The mD2 Ansatz is required for accurate aggregate absorption spectra, unlike the standard Davydov D2 Ansatz.
  • * Analysis of open and closed chain aggregates across varying coupling and temperature.
  • * Observed out-of-phase oscillatory wavepacket dynamics and broadening, indicating non-parabolic vibronic energy surfaces.

Conclusions:

  • * The mD2 Ansatz provides a more robust framework for studying molecular aggregate spectra.
  • * The findings highlight the importance of electron-vibrational coupling in aggregate optical properties.
  • * Wavepacket dynamics reveal complex vibronic interactions and non-parabolic energy landscapes.