2021/02/19 by Xiujuan Zhang, Yuan Tian, Jian-Hua Jiang +5 · 323 citations
Physics and Astronomy · #Business #Hermitian matrix #Noncommutative and Quantum Gravity Theories #Order (exchange) #Physics #Quantum Mechanics and Non-Hermitian Physics #Quantum mechanics #Topological Materials and Phenomena #cond-mat.mtrl-sci #physics.app-ph
paper · pdf · doi:10.1038/s41467-021-25716-y
published in Nature Communications 12(1), 5377 (Nature Portfolio)
arxiv created 2021/02/19 · openalex publication_date 2021/09/10 · arxiv updated 2021/10/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Beyond the scope of Hermitian physics, non-Hermiticity fundamentally changes the topological band theory, leading to interesting phenomena, e.g., non-Hermitian skin effect, as confirmed in one-dimensional systems. However, in higher dimensions, these effects remain elusive. Here, we demonstrate the spin-polarized, higher-order non-Hermitian skin effect in two-dimensional acoustic higher-order topological insulators. We find that non-Hermiticity drives wave localizations toward opposite edges upon different spin polarizations. More interestingly, for finite systems with both edges and corners, the higher-order non-Hermitian skin effect leads to wave localizations toward two opposite corners for all the bulk, edge and corner states in a spin-dependent manner. We further show that such a skin effect enables rich wave manipulation by configuring the non-Hermiticity. Our study reveals the intriguing interplay between higher-order topology and non-Hermiticity, which is further enriched by the pseudospin degree of freedom, unveiling a horizon in the study of non-Hermitian physics.