Wake effect in interactions of dipolar molecules with doped graphene

Abstract

We study the wake effect in the charge carrier density in free graphene induced by an electric dipole moving parallel to it by using the dynamic polarization function of graphene within the random phase approximation for its π electrons described as Diracʼs fermions. We show that, while the equilibrium doping density of graphene sets a length scale for the period of the wake via grapheneʼs Fermi wavenumber, qualitative properties of the wake are strongly affected by the speed of the dipole, its distance from graphene, and the dipole moment orientation. • We present the wake effect in free graphene due to moving dipolar molecule. • Induced charge density in graphene is calculated with the RPA model. • Oscillatory wake effect develops in the induced charge density trailing the dipole. • Strong effects are observed in the wake pattern due to dipole moment orientation.