Non-reciprocity with graphene magnetoplasmons and application to plasmonic isolators

Plasmons and magnetoplasmons along a graphene strip immersed in a uniform tangential electric field are investigated. The uniform electric field creates a p-n junction in the middle of the strip. In the case of a magnetic bias, the magnetoplasmon mode localized at the p-n junction propagates only in one direction, thus realizing a plasmonic isolator. Other plasmonic p-n junction configurations are proposed to realize low-loss plasmonic isolators.