PT symmetry breaking in optical systems

[Ricvil]

There are very results published about PT symmetry breaking in optical systems, with effects like anysotropical transmission resonance in waveguides.
But if PT symmetry is broken in a optical system and CPT symmetry must always be respected, then what C symmetry is broken in a optical system?

 

[mfb]

Do you have a reference?
I guess the breaking is related to material properties - the material does not have to be symmetric. Exact T transformation would mean you have to replace matter-waveguides by antimatter-waveguides - I doubt they did that!

 

[Ricvil]

This appears a initial good reference.

http://cqdmp.research.wesleyan.edu/research/pt-symmetry/

 

[mfb]

A matter effect. The matter is not symmetric, there is no PT violation on a fundamental level.