Plasmon–phonon coupling in graphene–hyperbolic bilayer heterostructures
Yin Ge, Yuan Jun, Jiang Wei, Zhu Jianfei, Ma Yungui†,
       

Dispersions of graphene–ZnO heterostructure, (a) without graphene and (b) with graphene. (c), (d) The corresponding field profiles labeled by the red dots in panels (a) and (b) at ω = 400 cm−1, respectively.