  An elementary excitation in an aggregate of coupled particles generates a
collective excited state. We show that the dynamics of these excitations can be
controlled by applying a transient external potential which modifies the phase
of the quantum states of the individual particles. The method is based on an
interplay of adiabatic and sudden time scales in the quantum evolution of the
many-body states. We show that specific phase transformations can be used to
accelerate or decelerate quantum energy transfer and spatially focus
delocalized excitations onto different parts of arrays of quantum particles. We
consider possible experimental implementations of the proposed technique and
study the effect of disorder due to the presence of impurities on its fidelity.
We further show that the proposed technique can allow control of energy
transfer in completely disordered systems.
