The contrast between defect solitons in parity-time symmetric superlattice and simple-lattice complex potentials

The existence and stability of defect superlattice solitons in parity-time （PT） symmetric superlattice and simplelattice complex potentials are reported. Compared with defect simple-lattice solitons in similar potentials, the defect soliton in superlattice has a wider stable range than that in simpl...

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Bibliographic Details
Published in:Chinese physics B 2012-02, Vol.21 (2), p.362-367, Article 024212
Main Author: 胡素梅 胡巍
Format: Article
Language:English
Subjects:
Constants
Defects
Solitons
Stability
Superlattices
Symmetry
传播常数
奇偶
孤子
对称
无限大
稳定性
超晶格
零缺陷
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Summary:The existence and stability of defect superlattice solitons in parity-time （PT） symmetric superlattice and simplelattice complex potentials are reported. Compared with defect simple-lattice solitons in similar potentials, the defect soliton in superlattice has a wider stable range than that in simple-lattice. The solitons＇ power increases with increasing propagation constant. For the positive defect, the solitons are stable in the whole region where solitons exist in the semi-infinite gap. For the zero defect, the solitons are unstable at the edge of the band. For the negative defect, the solitons propagate with the shape of Y at low propagation constant and propagate stably at the large one.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/2/024212