Defect solitons supported by parity-time symmetric defects in superlattices

作     者：胡素梅 胡巍 

作者机构：Department of PhysicsGuangdong University of Petrochemical Technology Laboratory of Photonic Information TechnologySouth China Normal University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2013年第22卷第7期

页      面：192-196页

核心收录：

学科分类：070207[理学-光学] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：the National Natural Science Foundation of China(Grant Nos.10804033 11174090 and 11174091) 

主　　题：defect solitons parity-time symmetric defect superlattices 

摘      要：The existence and stability of defect solitons supported by parity-time （PT） symmetric defects in superlattices are investigated. In the semi-infinite gap, in-phase solitons are found to exist stably for positive defects, zero defects, and negative defects. In the first gap, out-of-phase solitons are stable for positive defects or zero defects, whereas in-phase solitons are stable for negative defects. For both the in-phase and out-of-phase solitons with the positive defect and in-phase solitons with negative defect in the first gap, there exists a cutoff point of the propagation constant below which the defect solitons vanish. The value of the cutoff point depends on the depth of defect and the imaginary parts of the PT symmetric defect potentials. The influence of the imaginary part of the PT symmetric defect potentials on soliton stability is revealed.