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Recently, faculty and students from the School of Physics and Electronic Engineering of our university published their latest research paper entitled "Observation of disorder-induced boundary localization" in PNAS, an international top-tier journal. Jiangsu University is the first completing unit of this paper. Wang Bingbing, a 2021-level master's student from Jiangsu University, and Cheng Zheyu, a doctoral student from Nanyang Technological University (Singapore), are the co-first authors. Professor Sun Hongxiang from Jiangsu University, Assistant Professor Xue Haoran from The Chinese University of Hong Kong, and Professor Zhang Bole from Nanyang Technological University (Singapore) are the co-corresponding authors.

This study focuses on the phenomenon of disorder-induced boundary localization and reports the first experimental observation of the disorder-induced non-Hermitian skin effect (NHSE). A one-dimensional phononic crystal with disordered nonreciprocal coupling coefficients was designed and realized based on acoustic amplification circuits, and the acoustic non-Hermitian skin effect was experimentally observed. For excitation frequencies within the point gap, acoustic energy is localized at the boundaries of the phononic crystal. On this basis, adjusting the disorder strength of the coupling coefficients reverses the direction of localization. Furthermore, this study proposes and observes the disorder-induced bilateral non-Hermitian skin effect for the first time. By introducing disordered nonreciprocal next-nearest-neighbor coupling into the phononic crystal, acoustic energy localizes on different sides of the phononic crystal under excitations in different frequency domains. This discovery breaks through the theoretical framework of traditional Anderson localization, where a large number of wavefunctions are localized at the system boundaries rather than in the bulk, opening up a new direction for the interdisciplinary research of non-Hermitian disorder and topological physics.

This research was supported by the National Natural Science Foundation of China, the National Key Research and Development Program of China, and other projects.

(School of Physics and Electronic Engineering)