Stabilization of fundamental solitons in the nonlinear fractional Schrödinger equation with PT-symmetric nonlinear lattices

Weiwei Su, Hanying Deng, Liangwei Dong, Zhenfen Huang and Changming Huang

Chaos, Solitons & Fractals, 2020, vol. 141, issue C

Abstract: We investigate the existence and stability of fundamental solitons in the focusing nonlinear fractional Schrödinger equation with PT-symmetric nonlinear lattices. We show that in sharp contrast to the linear PT-symmetric lattice where stable fundamental solitons can be found only at a lower gain-loss level, PT-symmetric nonlinear lattices can support them at a higher gain-loss parameter. The localized profile of a fundamental soliton becomes narrower with an increase in the propagation constant or a decrease in the Lévy index. The velocity of the power-flow vector of fundamental solitons at a small propagation constant is faster than that with a large propagation constant. We also reveal that the stability region of fundamental solitons increases with the growth of the Lévy index. As the gain-loss level is increased, the stable domain can be extended with an increased propagation constant. These stability results were obtained by linear stability analysis and numerical simulations. The excitations of robust nonlinear fundamental states in the nonlinear fractional Schrödinger equation with PT-symmetric nonlinear lattices are studied as well.

Keywords: Spatial solitons; Stability; Fractional Schrödinger equation; Propagation dynamics (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:141:y:2020:i:c:s0960077920308201

DOI: 10.1016/j.chaos.2020.110427

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