Repulsion of polarized particles from two-dimensional materials

Francisco J. Rodríguez-Fortuño, Michela F. Picardi, and Anatoly V. Zayats

Repulsion of nanoparticles, molecules, and atoms from surfaces can have important applications in nanomechanical devices, microfluidics, optical manipulation, and atom optics. Here, through the solution of a classical scattering problem, we show that a dipole source oscillating at a frequency $\omega$ can experience a robust and strong repulsive force when its near-field interacts with a two-dimensional material. As an example, the case of graphene is considered, showing that a broad bandwidth of repulsion can be obtained at frequencies for which propagation of plasmon modes is allowed $0<\hslash \omega <\left(5/3\right){\mu }_c$, where ${\mu }_c$ is the chemical potential tunable electrically or by chemical doping.

DOI