Observation of topological transitions associated with a Weyl exceptional ring

• URL: http://arxiv.org/abs/2407.00903v2
• Date: Wed, 11 Sep 2024 00:56:36 GMT
• Title: Observation of topological transitions associated with a Weyl exceptional ring
• Authors: Hao-Long Zhang, Pei-Rong Han, Xue-Jia Yu, Shou-Bang Yang, Jia-Hao Lü, Wen Ning, Fan Wu, Qi-Ping Su, Chui-Ping Yang, Zhen-Biao Yang, Shi-Biao Zheng,
• Abstract summary: Weyl exceptional rings (WER), extended from point-like singularities, are particularly interesting. We here investigate this topology in a circuit, where the WER is synthesized with a superconducting qubit controllably coupled to a decaying resonator. We demonstrate a topological transition triggered by shrinking the size of the manifold$-$a unique feature of the WER.
• Score: 1.877600262062263
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The environment-induced dissipation of an open system, once thought as a nuisance, can actually lead to emergence of many intriguing phenomena that are absent in an isolated system. Among these, Weyl exceptional rings (WER), extended from point-like singularities, are particularly interesting. Theoretically, a WER was predicted to carry a topological charge with a nonzero Chern number, but it has not been measured so far. We here investigate this topology in a circuit, where the WER is synthesized with a superconducting qubit controllably coupled to a decaying resonator. The high flexibility of the system enables us to characterize its eigenvectors on different manifolds of parameter space. We extract both the quantized Berry phase and Chern number from these eigenvectors. Furthermore, we demonstrate a topological transition triggered by shrinking the size of the manifold$-$a unique feature of the WER.

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