Non-linear dynamics of the non-Hermitian Su-Schrieffer-Heeger model

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 non-linear 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 non-linear 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 non-linearities.

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Cited by in corpus (7)

• Perspective: non-Hermitian physics in magnetic systems
• Exceptional points as signatures of dynamical magnetic phase transitions
• Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points
• Solid-state platform for cooperative quantum dynamics driven by correlated emission
• Multitude of exceptional points in van der Waals magnets
• Nonlinear dynamics of topological helicity wave in a frustrated skyrmion string
• Supercharging exceptional points: Full-spectrum pairwise coalescence in non-Hermitian systems