Observation of PT-symmetry breaking in complex optical potentials.

@article{Guo2009ObservationOP,
  title={Observation of PT-symmetry breaking in complex optical potentials.},
  author={Aqiang Guo and Gregory J. Salamo and David Duchesne and R. Morandotti and Maite Volatier-Ravat and Vincent Aimez and Georgios A. Siviloglou and Demetrios N Christodoulides},
  journal={Physical review letters},
  year={2009},
  volume={103 9},
  pages={
          093902
        }
}
In 1998, Bender and Boettcher found that a wide class of Hamiltonians, even though non-Hermitian, can still exhibit entirely real spectra provided that they obey parity-time requirements or PT symmetry. Here we demonstrate experimentally passive PT-symmetry breaking within the realm of optics. This phase transition leads to a loss induced optical transparency in specially designed pseudo-Hermitian guiding potentials. 
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