期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.223902
关键词
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资金
- DFG Forschergruppe 760
- Cluster of Excellence Engineering of Advanced Materials
- German-Israeli Foundation
- NSF [ECCS-1128520]
- AFOSR [FA95501210148]
We provide the first experimental demonstration of defect states in parity-time (PT) symmetric mesh-periodic potentials. Our results indicate that these localized modes can undergo an abrupt phase transition in spite of the fact that they remain localized in a PT-symmetric periodic environment. Even more intriguing is the possibility of observing a linearly growing radiation emission from such defects provided their eigenvalue is associated with an exceptional point that resides within the continuum part of the spectrum. Localized complex modes existing outside the band-gap regions are also reported along with their evolution dynamics.
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