  The dynamics of a dimer coupled to two different environments each in a spin
star configuration under the influence of decoherence is studied. The exact
analytical expression for the transition probability in the dimer system is
obtained for different situations, i.e., independent and correlated
environments. In all cases considered, it is shown that there exist
well-defined ranges of parameters for which decoherent interaction with the
environment assists energy transfer in the dimer system. In particular, we find
that correlated environments can assist energy transfer more efficiently than
separate baths.
