The PT Symmeter » Moscow Institute of Physics and Technology http://ptsymmetry.net PT Symmetry articles and information Wed, 24 Dec 2014 09:54:41 +0000 en hourly 1 http://wordpress.org/?v=3.0.4 Causality and phase transitions in PT-symmetrical optical systems http://ptsymmetry.net/?p=1496&utm_source=rss&utm_medium=rss&utm_campaign=causality-and-phase-transitions-in-pt-symmetrical-optical-systems http://ptsymmetry.net/?p=1496#comments Fri, 17 Jan 2014 09:55:00 +0000 dwh http://ptsymmetry.net/?p=1496 A. A. Zyablovsky, A. P. Vinogradov, A. V. Dorofeenko, A. A. Pukhov, A. A. Lisyansky

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.

http://arxiv.org/abs/1401.4043

Optics (physics.optics); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Physics (quant-ph)

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