Non-adiabatic dynamics in electron phonon coupled system
Abstract:
We consider an interacting two-electron system linearly coupled to
the vibrational harmonic degree of freedom, focusing on the nonlinear dynamics
of the vibrational wavepackets. This problem has significant importance
in understanding vibrational dynamics in photo-excited biomolecules. The
non-adiabatic coupling between the ground and excited state adiabatic surfaces
is analyzed in detail, and found to be significant at the crossing points.
This corresponds to the scattering of the ground state vibration wavepackets
into the excited state adiabatic surfaces, and eventually to the lost of
the coherence between the excited and the ground state wavepackets. This
effect should have a clear signature in the nonlinear optical response,
which we are currently investigating.