  Large photon drag effect of the massless Dirac Fermions in intrinsic graphene
is predicted for a graphene-on-plasmonic-layer system. The surface plasmons in
the plasmonic layer enlarge the wave number of photon for hundreds of time of
that in vacuum. The evanescent field of the surface plasmons generates
directional motion of carriers in the intrinsic graphene, because of the large
momentum transfer from the surface plasmon to the excited carriers. A model
Hamiltonian is developed on the assumption that the in-plane wavelength of the
surface plasmons is much smaller than the mean free path of the carriers. The
time evolution of density matrix is solved by perturbation method as well as
numerical integration. The non-diagonal density matrix elements with momentum
transfer lead to gauge current that is the optically driven macroscopic direct
current. The dependence of the macroscopic direct current on the incident
direction and intensity of the laser field is studied.
