Intramolecular energy flow in the condensed phase: effects of dephasing on localization in the quantum stochastic pump model

Stochastic pump models have been widely used to describe the classical dynamics of isolated, multidimensional weakly chaotic systems, such as the nuclear motion of a molecule in a regime of weak rovibrational coupling. We recently showed that quantization severely restricts energy flow in the stochastic pump model. We show here how introducing a weak external noise mimicking the effect of dephasing collisions to the quantum stochastic pump model has dramatic consequences for the flow.