Knot topology of exceptional point and non-Hermitian no-go theorem
Exceptional points (EPs) are peculiar band singularities and play a vital role in a rich array of unusual optical phenomena and non-Hermitian band theory. In this Letter, we provide a topological classification of isolated EPs based on homotopy theory. In particular, the classification indicates tha...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-06-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.L022064 |