  The interaction between electrons and the vibrational degrees of freedom of a
molecular quantum dot can lead to an exponential suppression of the
conductance, an effect which is commonly termed Franck-Condon blockade. Here,
we investigate this effect in a quantum dot driven by time-periodic gate
voltages and tunneling amplitudes using nonequilibrium Green's functions and a
Floquet expansion. Building on previous results showing that driving can lift
the Franck-Condon blockade, we investigate driving protocols which can be used
to pump charge across the quantum dot. In particular, we show that due to the
strongly coupled nature of the system, the pump current at resonance is an
exponential function of the drive strength.
