Four-channel parity-time symmetry

¹ Department of Physics Engineering, Hacettepe University, Beytepe - 06800 Ankara, Turkey
² NANOTAM-Nanotechnology Research Center, Bilkent University - 06800 Ankara, Turkey
³ Department of Physics, Department of Electrical and Electronics Engineering and UNAM-Institute of Materials Science and Nanotechnology, Bilkent University - 06800 Ankara, Turkey
⁴ Electrical and Electronics Engineering Department, TOBB University of Economics and Technology 06560, Ankara, Turkey

^(a) E-mail: egeozgun@hacettepe.edu.tr (corresponding author)

Received: 3 May 2022
Accepted: 20 September 2022

Abstract

In this letter, we propose a general scheme for four-channel parity-time symmetry. We theoretically demonstrate how to achieve novel features via exploiting the parity-time symmetry for four-channel coupled-mode equations and study the spontaneous symmetry breaking manifold, separating the parity-time symmetric and parity-time broken regimes, for various parameter configurations. We also propose a possible candidate (an optoelectronic oscillator) which can demonstrate the theoretically derived features, which include broadband tunability, eigenfrequency selection and flipping, and single/dual frequency operation regimes.