Defect solitons supported by nonlocal PT symmetric superlattices

Abstract

The existence and stability of defect solitons supported by parity-time (PT) symmetric superlattices with nonlocal nonlinearity are investigated. In the semi-infinite gap, in-phase solitons are found to exist stably for positive or zero defects, but can not exist in the presence of negative defects with strong nonlocality. In the first gap, out-of-phase solitons are stable for positive or zero defects, whereas in-phase solitons are stable for negative defects. The dependence of soliton stabilities on modulation depth of the PT potentials is studied. It is interesting that solitons can exist stably for positive and zero defects when the PT potentials are above the phase transition points.

12 figures, 6 pages, Accepted by EPL

References in corpus (5)

• Unidirectional Invisibility induced by PT-Symmetric Periodic Structures
• Experimental Study of Active LRC Circuits with PT-Symmetries
• Unidirectional Nonlinear PT-symmetric Optical Structures
• Solitons in PT-symmetric nonlinear lattices
• PT-Symmetric Wave Chaos

Cited by in corpus (5)

• Nonlinear waves in $\mathcal{P}\mathcal{T}$-symmetric systems
• Nonlinear switching and solitons in PT-symmetric photonic systems
• Nonlocal gap solitons in PT-symmetric periodic potentials with defocusing nonlinearity
• Optical Solitons in a Trinal-channel Inverted Nonlinear Photonic Crystal
• Small-amplitude nonlinear modes under the combined effect of the parabolic potential, nonlocality and $\mathcal{P}\mathcal{T}$ symmetry