Surface plasmons at the interface between graphene and kerr-type   nonlinear medium
  The properties of surface plasmons localized at the interface between graphene and kerr-type nonlinear medium in three dimensions are investigated. Compared with surface plasmons at the surface of metal, with the inevitable nonlinear refractive effect, the confinement of plasmon can be improved to three times than graphene plasmons without nonlinear contribution, but also with almost the same relative propagation length. Moreover, the dispersion relation and propation distance of graphene plasmons can be easily controlled by changing the fermi energy, temperature and relaxation time of graphene. Our results suggest a simple but useful potential application for precise nonlinear material sensor using graphene plasmons. 
Lei Wang, Wei Cai, Xinzheng Zhang, F. J. Garcia de Abajo, and Jingjun   Xu
cond-mat.mes-hall