1 School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang 212013, China; 2 Jiangsu Engineering Research Center on Quantum Perception and Intelligent Detection of Agricultural Information, Zhenjiang 212013, China
Abstract We investigate magnonic topology in the breathing Su-Schrieffer-Heeger (SSH) model, incorporating non-Hermitian effects. Our results demonstrate the coexistence of first- and second-order magnonic topologies, with non-Hermitian effects exhibiting size-dependent behavior. In two-dimensional systems, non-Hermitian terms induce a flat band and gap closure along high-symmetry paths, whereas in one-dimensional systems, a finite band gap persists for small system sizes. Additionally, the corner states remain robust, and a pronounced non-Hermitian skin effect emerges. Our findings provide new insights into magnon-based devices, emphasizing the impact of non-Hermitian effects on their design and functionality.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12347156, 12174157, 12074150, and 12174158), the National Key Research and Development Program of China (Grant No. 2022YFA1405200), the Natural Science Foundation of Jiangsu Province (Grant No. BK20230516), and the Scientific Research Project of Jiangsu University (Grant No. 550171001).
Huasu Fu(付华宿), Lichuan Zhang(张礼川), Rami Mrad, Yuee Xie(谢月娥), and Yuanping Chen(陈元平) First- and second-order magnonic topologies in the ferromagnetic breathing SSH model modulated by non-Hermitian effects 2025 Chin. Phys. B 34 067506
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