  In this work, we study the effects of non-Condon vibronic coupling on the
quantum coherence of excitation energy transfer, via the exact
dissipaton-equation-of-motion (DEOM) evaluations on excitonic model systems.
Field-triggered excitation energy transfer dynamics and two dimensional
coherent spectroscopy are simulated for both Condon and non-Condon vibronic
couplings. Our results clearly demonstrate that the non-Condon vibronic
coupling intensifies the dynamical electronic-vibrational energy transfer and
enhances the total system-and-bath quantum coherence. Moreover, the hybrid bath
dynamics for non-Condon effects enriches the theoretical calculation, and
further sheds light on the interpretation of the experimental nonlinear
spectroscopy.
