  We consider an Aharonov-Bohm interferometer, connected to two electronic
reservoirs, with a quantum dot embedded on one of its arms. We find a general
expression for the persistent current at steady state, valid for the case where
the electronic system is free of interactions except on the dot. The result is
used to derive the modification in the persistent current brought about by
coupling the quantum dot to a phonon source. The magnitude of the persistent
current is found to be enhanced in an appropriate range of the intensity of the
acoustic source.
