Mercredi 22 juin 2022 à 11h
Sorbonne Université – INSP – 4 place Jussieu – 75005 Paris – Barre 22-23, salle 317
Benedetta Flebus – Department of Physics, Boston College, Chestnut Hill, Massachusetts, USA
Abstract
While magnetic systems have been extensively studied both from a fundamental physics perspective and as building blocks for a variety of applications, their topological properties, however, remain relatively unexplored due to their inherently dissipative nature.
I will start this talk by discussing how the recent introduction of non-Hermitian topological classifications has opened up opportunities for engineering topological phases in magnetic systems, and I will present our first proposal of a non-Hermitian topological magnonic system, i.e., a realization of an SSH non-Hermitian model via a one-dimensional spin-torque oscillator array [1,2].
Further, I will show how magnetic exceptional points can unveil large-amplitude auto-oscillatory regimes in nano-oscillators [3]. Finally, I will discuss the conditions under which magnetic insulating systems can host one of the most striking non-Hermitian phenomena with no Hermitian counterpart, i.e., the skin effect, which underlies the breakdown of the bulk-edge correspondence [4].
References
1. B. Flebus *et al.*, Phys. Rev. B 102, 180408 (2020).
2. P. M. Gunnink *et al*., arXiv:2201.07678 (2022).
3. K. Deng *et al*., arXiv:2205.02308 (2022)
4. K. Deng *et al.*, Phys. Rev. B 105, L180406 (2022).
