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.
| Original language | English |
|---|---|
| Article number | 104433 |
| Pages (from-to) | 1-10 |
| Journal | Physical Review B |
| Volume | 105 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 1 Mar 2022 |
Bibliographical note
Funding Information:R.D. is member of the D-ITP consortium, a program of the Dutch Organization for Scientific Research (NWO) that is funded by the Dutch Ministry of Education, Culture and Science (OCW). This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 725509). This work is part of the research programme of the Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organization for Scientific Research (NWO). This work is part of the Fluid Spintronics research programme with Project No. 182.069, which is financed by the Dutch Research Council (NWO) B.F. acknowledges support of the National Science Foundation under Grant No. NSF DMR-2144086.
Publisher Copyright:
© 2022 American Physical Society.
Funding
R.D. is member of the D-ITP consortium, a program of the Dutch Organization for Scientific Research (NWO) that is funded by the Dutch Ministry of Education, Culture and Science (OCW). This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 725509). This work is part of the research programme of the Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organization for Scientific Research (NWO). This work is part of the Fluid Spintronics research programme with Project No. 182.069, which is financed by the Dutch Research Council (NWO) B.F. acknowledges support of the National Science Foundation under Grant No. NSF DMR-2144086.