Ultralow threshold bistability and generation of long-lived mode in a dissipatively coupled nonlinear system: application to magnonics

TL;DR

This paper demonstrates that dissipative coupling in nonlinear systems enables low-threshold bistability transfer and the emergence of long-lived modes, with significant implications for magnonic information processing.

Contribution

It introduces a generic model showing how dissipative coupling lowers bistability thresholds and generates long-lived modes, demonstrated specifically in magnonic systems.

Findings

Dissipative coupling reduces bistability threshold by about five times.

Long-lived modes emerge due to dissipation and nonlinearity, enhancing signal transmission.

Bistability can be spectroscopically studied via probe fields in the waveguide.

Abstract

The prospect of a system possessing two or more stable states for a given excitation condition is of topical interest with applications in information processing networks. In this work, we establish the remote transfer of bistability from a nonlinear resource in a dissipatively coupled two-mode system. As a clear advantage over coherently coupled settings, the dissipative nature of interaction is found to support a lower pumping threshold for bistable signals. For comparable parameters, the bistability threshold for dissipatively coupled systems is lower by a factor of about five. The resulting hysteresis can be studied spectroscopically by applying a probe field through the waveguide and examining the polariton character of the transmitted field. Our model is generic, apropos of an extensive set of quantum systems, and we demonstrate our results in the context of magnonics where experimental interest has flourished of late. As a consequence of dissipative coupling and the nonlinearity, a long-lived mode emerges, which is responsible for heightened transmission levels and pronounced sensitivity in signal propagation through the fiber.