Comment on "Symmetry Breaking and Laser-Absorber Modes in Optical Scattering Systems"
A. A. Zyablovsky, A. P. Vinogradov, A. V. Dorofeenko, A. A. Pukhov,, and A. A. Lisyansky
TL;DR
This paper argues that PT-symmetry in optical systems is limited to specific frequencies, implying that symmetry-breaking transitions cannot be observed through spectral measurements of scattered intensity.
Contribution
It clarifies the limitations of PT-symmetry breaking in optical systems, challenging previous claims of observable transitions in spectral data.
Findings
PT-symmetry exists only at isolated frequencies
PT-symmetry breaking transitions are not observable in scattered intensity spectra
Spectral measurements do not reveal symmetry-breaking transitions
Abstract
We show that PT-symmetry may exist only for isolated frequencies in optical systems. Therefore, PT-symmetry breaking transitions as the frequency is tuned up, discussed in Y. D. Chong, L. Ge, and A. D. Stone, Phys. Rev. Lett. 106, 093902 (2011), cannot be observed in measurements of the spectrum of scattered intensity.
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Taxonomy
TopicsQuantum Mechanics and Non-Hermitian Physics · Mechanical and Optical Resonators