  We investigate the strain-induced coupling between a nitrogen-vacancy
impurity and a resonant vibrational mode of a diamond nanoresonator. We show
that under near-resonant laser excitation of the electronic states of the
impurity, this coupling can modify the state of the resonator and either cool
the resonator close to the vibrational ground state or drive it into a large
amplitude coherent state. We derive a semi-classical model to describe both
effects and evaluate the stationary state of the resonator mode under various
driving conditions. In particular, we find that by exploiting resonant single
and multi-phonon transitions between near-degenerate electronic states, the
coupling to high-frequency vibrational modes can be significantly enhanced and
dominate over the intrinsic mechanical dissipation. Our results show that a
single nitrogen-vacancy impurity can provide a versatile tool to manipulate and
probe individual phonon modes in nanoscale diamond structures.
