Achieving partial decoherence in surface hopping through phase correction.

Area of Science:

• Computational Chemistry
• Quantum Dynamics
• Chemical Physics

Background:

• Fewest-switches surface hopping is a widely used computational method for studying nonadiabatic processes.
• A recent phase correction significantly improved the accuracy of surface hopping without increasing computational cost.
• Understanding decoherence is crucial for accurate simulations of quantum dynamics.

Purpose of the Study:

• To modify the phase-corrected surface hopping algorithm to include decoherence effects.
• To assess the ability of the modified algorithm to capture a specific type of decoherence.
• To demonstrate that decoherence can be incorporated without additional computational expense.

Main Methods:

• Modification of a previously developed phase-corrected surface hopping algorithm.
• Inclusion of a specific decoherence mechanism into the modified algorithm.
• Application and testing of the enhanced algorithm on two established model problems.

Main Results:

• The modified algorithm successfully incorporates a type of decoherence.
• The inclusion of decoherence was achieved with no increase in computational cost.
• The algorithm demonstrated its capability to capture decoherence effects in model systems.

Conclusions:

• The enhanced surface hopping algorithm provides a computationally inexpensive way to model decoherence in nonadiabatic processes.
• This method offers a simplified approach to simulating quantum dynamics compared to more complex algorithms.
• The findings suggest a practical improvement for computational studies of chemical reactions and molecular dynamics.