2023/07/01 by Cai, Chengyuan, Kennes, Dante M., Sentef, Michael A. +1 · 1 citation
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
paper · doi:10.48550/arxiv.2307.00353
We investigate a long-ranged coupled and non-Hermitian two-dimensional array of nanomagnets, fabricated on a thin magnetic substrate and subjected to an in-plane magnetic field. We predict topology-driven edge and corner skin effects of magnetic eigenmodes with the localization position at boundaries precisely characterized by a topological winding tuple (\cal W1,\cal W2). By varying the direction of the in-plane field, all magnon states pile up either at different edges of the array with (\cal W1=± 1,\cal W2=0) or (\cal W1=0,\cal W2=± 1), or at different corners characterized by (\cal W1=± 1,\cal W2=± 1). Exploiting the non-Hermitian topology is potentially helpful for designing useful magnonic metasurface in the future.