Publication Date

3-1-2022

Document Type

Article

Publication Title

Physical Review B

Volume

105

Issue

10

DOI

10.1103/PhysRevB.105.104433

Abstract

We numerically determine the robustness of the lasing edge modes in a spin-torque oscillator array that realizes the non-Hermitian Su-Schrieffer-Heeger model. Previous studies found that the linearized dynamics can enter a topological regime in which the edge mode is driven into auto-oscillation, while the bulk dynamics are suppressed. Here we investigate the full nonlinear and finite-temperature dynamics, whose understanding is essential for spin-torque oscillators-based applications. Our analysis shows that the lasing edge mode dynamics persist in the nonlinear domain for a broad range of parameters and temperatures. We investigate the effects of perturbations relevant to experimental implementations and discuss which ones might be detrimental to the stability of the lasing edge mode. Finally, we map our model onto a photonic model. Our analysis has the potential to shed light onto the dynamics of a plethora of non-Hermitian systems with nonlinearities.

Funding Number

182.069

Funding Sponsor

National Science Foundation

Comments

This article originally appeared in Physical Review B, volume 105, 2022, published by the American Physical Society. ©2020 American Physical Society. The article can also be found online at this link.

Department

Physics and Astronomy

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