Plasma solitons in gated two-dimensional electron systems: Exactly solvable analytical model for the regime beyond weak nonlinearity

Abstract

We analytically study plasma solitary waves, or solitons, in a two-dimensional electron system placed in close proximity to and between two ideal metallic gates. As a rule, solitons are described using a perturbative approach applicable only in the weak nonlinearity regime. In contrast, we analyze solitons considering a nonperturbative model. This framework enables an exact analytical description of the soliton shape. Moreover, it can be achieved in the regime beyond weak nonlinearity---when the concentration deviation due to the soliton is of the order of the equilibrium concentration. We determine the conditions required for a soliton to exist and derive the relationship between its amplitude, width, and velocity. We believe that our results obtained for the given model can provide valuable insight into the physics of nonlinear waves.