Modeling Non-adiabatic Dynamics in Nanoscale and Condensed Matter Systems

Area of Science:

• Physical Chemistry
• Materials Science
• Computational Physics

Background:

• Modern technologies rely on rapid, far-from-equilibrium processes involving electronic, vibrational, and spin degrees of freedom.
• Time-resolved spectroscopies enable experimental tracking of ultrafast dynamics at an atomistic level.
• Theoretical modeling is crucial for interpreting experimental data and understanding complex material behaviors.

Purpose of the Study:

• To explore recent developments in non-adiabatic molecular dynamics (NA-MD) for studying excited-state processes.
• To investigate the incorporation of nanoscale phenomena into NA-MD simulations.
• To identify approximations for enhancing NA-MD efficiency in complex systems.

Main Methods:

• Utilizing non-adiabatic molecular dynamics (NA-MD) for atomistic, time-domain simulations.
• Employing electronic structure methods to determine excited-state energies and non-adiabatic couplings.
• Focusing on classical or semi-classical treatment of atomic motions, a key NA-MD approximation.

Main Results:

• NA-MD provides atomistic origins of quasi-particles like excitons and polaritons.
• Atomistic modeling accounts for realistic material features such as defects and interfaces.
• The study considers approximations for applying NA-MD to condensed phases and nanoscale systems.

Conclusions:

• NA-MD is a powerful tool for understanding ultrafast dynamics in molecules and materials.
• Adapting NA-MD for condensed phases and nanoscale systems requires specific approximations.
• This approach enhances the study of complex excited-state processes relevant to modern technologies.