Efficient local-orbitals based method for ultrafast dynamics

Area of Science:

• Computational chemistry
• Theoretical physics
• Materials science

Background:

• Ultrafast phenomena studies require direct access to electron dynamics.
• Existing computational methods can be resource-intensive.

Purpose of the Study:

• To present an efficient computational method for simulating electron evolution in molecules under time-dependent electric fields.
• To improve upon standard self-charge-consistent tight binding models.

Main Methods:

• Utilizing the Gaussian tight binding model.
• Incorporating polarizable orbitals and self-consistent charge multipoles.
• Applying the method to bithiophene, terthiophene, and tetrathiophene.

Main Results:

• The Gaussian tight binding model accurately reproduces electrostatic and electrodynamic properties.
• The model shows strong agreement with density-functional theory for time-dependent properties.
• Achieved accurate simulations at a significantly reduced computational cost.

Conclusions:

• The enhanced Gaussian tight binding model offers an efficient and accurate approach for simulating molecular electron dynamics.
• This method provides a cost-effective alternative to traditional density-functional theory for studying ultrafast phenomena.