Harnessing Nonlinearity to Tame Wave Dynamics in Nonreciprocal Active Systems

TL;DR

This paper introduces a mechanism leveraging nonlinearity in active, nonreciprocal systems to generate stable, unidirectional solitonic pulses, enhancing wave control in signal and energy applications.

Contribution

It demonstrates how nonlinearity can be used to control wave dynamics in nonreciprocal active systems, enabling stable unidirectional pulse propagation.

Findings

Unidirectional solitonic pulses are supported across various nonreciprocity levels.

Nonlinearity mediates the interplay between nonreciprocity, dispersion, and dissipation.

Experimental validation in electrical metamaterials confirms the theoretical predictions.

Abstract

We present a mechanism to generate unidirectional pulse-shaped propagating waves, tamed to exponential growth and dispersion, in active systems with nonreciprocal and nonlinear couplings. In particular, when all bulk modes are exponentially localized at one side of the lattice (skin effect), it is expected that wave dynamics is governed by amplification or decay until reaching the boundaries, even in the presence of dissipation. Our analytical results, and experimental demonstrations in an active electrical transmission line metamaterial, reveal that nonlinearity is a crucial tuning parameter in mediating a delicate interplay between nonreciprocity, dispersion, and dissipation. Consequently, undistorted unidirectional solitonic pulses are supported both for low and high nonreciprocity and pulse amplitude strength. The proposed mechanism facilitates robust pulse propagation in signal processing and energy transmission applications.