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Realization of non-Hermitian Hopf bundle matter

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Title
Realization of non-Hermitian Hopf bundle matter
Author(s)
Kim, Yung; Hee Chul Park; Kyung, Minwook; Lee, Kyungmin; Jung-Wan Ryu; You, Oubo; Zhang, Shuang; Min, Bumki; Moon Jip Park
Publication Date
2023-09
Journal
Communications Physics, v.6, no.1
Publisher
NATURE PUBLISHING GROUP
Abstract
Non-trivial linking invariant encodes robust information of topological matter. It has been recently shown that the linking and winding of complex eigenenergy strings can classify one-dimensional non-Hermitian topological matter. However, in higher dimensions, bundles of linked strings can emerge such that every string is mutually linked with all the other strings. To the best of our knowledge, a non-Hermitian Hopf bundle has not been experimentally clarified. Here, we attempt to explore the non-Hermitian Hopf bundle by visualizing the global linking structure of spinor strings in the momentum space of a two-dimensional electric circuit. By exploiting the flexibility of reconfigurable couplings between circuit nodes, we study the non-Hermitian topological phase transition by exploring the intricate structure of the Hopf bundle. Furthermore, we find that the higher-order skin effect in real space is accompanied by the linking of spinor strings in momentum space, revealing bulk-boundary correspondence between the two domains. © 2023, Springer Nature Limited.
URI
https://pr.ibs.re.kr/handle/8788114/14153
DOI
10.1038/s42005-023-01381-z
ISSN
2399-3650
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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