Observing non-Bloch braids and phase transitions by precise manipulation of the non-Hermitian boundary and size
Abstract The complex spectrum of non-Hermitian topological systems manifests extreme sensitivity to boundary perturbations when the system size is large. Hence, despite precise manipulation of non-Hermitian boundaries and sizes remains a challenge, it is of fundamental importance in developing ultra...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-025-02212-z |
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| Summary: | Abstract The complex spectrum of non-Hermitian topological systems manifests extreme sensitivity to boundary perturbations when the system size is large. Hence, despite precise manipulation of non-Hermitian boundaries and sizes remains a challenge, it is of fundamental importance in developing ultra-sensitive sensing devices. Here, we address this issue using a non-Hermitian static mechanical lattice platform, with the lower bound of the accessible boundary perturbation being 10−22, about tens of orders of magnitude better than current systems, for a maximal size exceeding 102. This performance facilitates the exploration of various extreme non-Hermitian phenomena. As a proof of concept, we demonstrate theoretically the braid topology of non-Hermitian non-Bloch bands, whose sensitivity increases exponentially with the size. Based on the static platform, we measure experimentally ultra-sensitive braid phase transitions. Our study unveils the nontrivial interplay among non-Hermiticity, braid topology, and spectral sensitivity, and reaches a much improved level of controllable non-Hermitian boundaries and sizes. |
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| ISSN: | 2399-3650 |