Car-Parrinello Molecular Dynamics With A Sinusoidal Time-Dependent   Potential Field
  We solve the problem of applying an external field in periodic boundary conditions by choosing a sine potential. We present an implementation in the Car-Parrinello molecular dynamics code (CPMD) and discuss applications to electron and ion transfers in complex molecular systems. 
Tobias Alznauer and Irmgard Frank
physics.chem-ph