Quantum dynamics of a vibronically coupled linear chain using a surrogate Hamiltonian approach

Area of Science:

• Quantum dynamics
• Materials science
• Spectroscopy

Background:

• Vibronic coupling is key for charge and exciton transport in organic electronics and light-harvesting systems.
• Accurate modeling requires explicit treatment of vibrational modes, not just as a thermal bath.

Purpose of the Study:

• To develop a methodology for studying quantum dynamics in vibronically coupled systems.
• To overcome limitations of Markov approximation and weak system-bath interactions.

Main Methods:

• A surrogate Hamiltonian approach is used within a vibronic basis.
• The method is applied to a linear chain system to analyze population dynamics.

Main Results:

• The vibronic surrogate Hamiltonian method accurately captures dissipative quantum dynamics.
• Demonstrates the influence of intramolecular and intermolecular vibrational relaxation on population dynamics.

Conclusions:

• The proposed methodology offers a robust way to study vibronic coupling effects.
• Understanding relaxation processes is vital for optimizing charge transport in organic materials.