2023-11-28 韓国基礎科学研究院(IBS)
◆この発見は非ヘルミシアンなトポロジカル相の理解を深め、将来的には量子センサーアプリケーションに電気回路ネットワークを活用する可能性が広がります。
＜関連情報＞
- https://www.ibs.re.kr/cop/bbs/BBSMSTR_000000000738/selectBoardArticle.do
- https://www.nature.com/articles/s42005-023-01381-z
非エルミート型ホップ束物質の実現 Realization of non-Hermitian Hopf bundle matter
Yung Kim,Hee Chul Park,Minwook Kyung,Kyungmin Lee,Jung-Wan Ryu,Oubo You,Shuang Zhang,Bumki Min & Moon Jip Park
Communications Physics Published:27 September 2023
DOI:https://doi.org/10.1038/s42005-023-01381-z
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.
