Causality and phase transitions in PT-symmetric optical systems

被引：62
|
作者：
Zyablovsky, A. A. [1 ]
Vinogradov, A. P.
Dorofeenko, A. V.
Pukhov, A. A.
Lisyansky, A. A. [2 ]
机构：
[1] All Russia Res Inst Automat, Moscow 127055, Russia
[2] CUNY Queens Coll, Dept Phys, Queens, NY 11367 USA
来源：
PHYSICAL REVIEW A | 2014年 / 89卷 / 03期
基金：
美国国家科学基金会;
关键词：
LIGHT-PROPAGATION;
D O I：
10.1103/PhysRevA.89.033808
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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.
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收藏
页数：4
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