Plasmonic drag photocurrent in graphene at extreme nonlocality

It is commonly assumed that photocurrent in two-dimensional systems with centrosymmetric lattice generated at structural inhomogenities, such as p-n junctions. Here, we study an alternative mechanism of generation associated inhomogenity the driving electromagnetic field, termed 'plasmonic drag'. direct momentum transfer from field to conduction electrons, and can be characterized by a non-local non-linear conductivity $\sigma^{(2)}({\bf q},\omega)$. By constructing classical kinetic model full account non-locality, show it resonantly enhanced for wave phase velocity coinciding electron Fermi velocity. The enhancement interpreted locking between electrons wave. We discuss possible experiment where non-uniform created propagating graphene plasmon, find upper limit current responsivity vs plasmon This set competition growing q},\omega)$ diverging energy approaches