Causality and phase transitions in PT-symmetrical optical systems
Optics
2015-06-18 v1 Mesoscale and Nanoscale Physics
Quantum Physics
Abstract
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.
Keywords
Cite
@article{arxiv.1401.4043,
title = {Causality and phase transitions in PT-symmetrical optical systems},
author = {A. A. Zyablovsky and A. P. Vinogradov and A. V. Dorofeenko and A. A. Pukhov and A. A. Lisyansky},
journal= {arXiv preprint arXiv:1401.4043},
year = {2015}
}