https://doi.org/10.1140/epjp/s13360-024-05249-1
Regular Article
The switching dynamics of self-defocusing nonlinear coupled system with PT-symmetric Scarf II barrier potential
Department of Physics, Farook College, University of Calicut, 673632, Kozhikode, Kerala, India
Received:
11
February
2024
Accepted:
6
May
2024
Published online:
28
May
2024
The eigenmodes and switching dynamics of parity–time (PT) symmetric coupled system with k-wavenumber Scarf II barrier potential in the self-defocusing nonlinear medium have been studied. Due to the interplay between nonlinear effects and PT-symmetric barrier potential, stable eigenmodes with central peaks are formed for weak nonlinearity and that with central dips are formed for high nonlinearity. The linear stability analysis is used to study the stability of the solution. The switching dynamics has been analysed by exciting the gain (lossy) channel with low and high input power in the unbroken and broken PT phases. In the PT regime, power oscillates between the channels for very low input; whereas, it is trapped in the excited channel keeping constant power during propagation for high input. On the other hand, in the broken PT regime, the power is trapped in the well region of the antisymmetric imaginary potential and it grows up during propagation for low and high input power. The input power-dependent switching and the influence of gain/loss effects in a nonlinear PT-symmetric coupled system are studied, which find applications in non-reciprocal light transmission and in the designing of on-chip optical devices such as all-optical diodes.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
