  We demonstrate that the interaction between two emitters can be controlled by
means of the efficient excitation of surface plasmon modes in graphene. We
consider graphene surface plasmons supported by either two-dimensional graphene
sheets or one-dimensional graphene ribbons, showing in both cases that the
coupling between the emitters can be strongly enhanced or suppressed. The
super- and subradiant regimes are investigated in the reflection and
transmission configurations. Importantly, the length scale of the coupling
between emitters, which in vacuum is fixed by the free space wavelength, is now
determined by the wavelength of the graphene surface plasmons that can be
extremely short and be tuned at will via a gate voltage.
