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Causality and phase transitions inPT-symmetric optical systems
2014
Physical Review A. Atomic, Molecular, and Optical Physics
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We discuss phase transitions in PT-symmetric optical systems. We show that due to frequency dispersion of the dielectric permittivity, an optical system can have PT-symmetry at isolated frequency points only. An assumption of the existence of a PT-symmetric system in a continuous frequency interval violates the causality principle. Therefore, the ideal symmetry-breaking transition cannot be observed by simply varying the frequency.
doi:10.1103/physreva.89.033808
fatcat:a53ugggzhnbifgrrxzoyzwnclq