Defect solitons supported by nonlocal PT symmetric superlattices

Details Defect solitons supported by nonlocal PT symmetric superlattices Defect solitons supported by nonlocal PT symmetric superlattices

2011-10-19

arxiv.org/abs/1110.4344v2

EPL(Europhysics Letters) Vol.98, No.1, 14006(2012)

Physics

Optics

12 figures, 6 pages, Accepted by EPL

Scientific paper

10.1209/0295-5075/98/14006

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.

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