Observation of the knot topology of non-Hermitian systems in a single spin
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2023-11-09 |
| Journal | Physical review. A/Physical review, A |
| Authors | Yang Wu, Yunhan Wang, Xiangyu Ye, Wenquan Liu, ChangāKui Duan |
| Institutions | Zhejiang University, University of Science and Technology of China |
| Citations | 6 |
Abstract
Section titled āAbstractāThe non-Hermiticity of the system gives rise to distinct knot topology that has no Hermitian counterpart. Here, we report a comprehensive study of the knot topology in gapped non-Hermitian systems based on the universal dilation method with a long-coherence-time nitrogen-vacancy center in a $^{12}\mathrm{C}$ isotope purified diamond. Both the braiding patterns of energy bands and the eigenstate topology are revealed. Furthermore, the global biorthogonal Berry phase related to the eigenstate topology has been successfully observed, which identifies the topological invariance for the non-Hermitian system. Our method paves the way for further exploration of the interplay among band braiding, eigenstate topology, and symmetries in non-Hermitian quantum systems.