Gap solitons in parity–time complex superlattice with dual periods
Wang Hong-Cheng (王红成)a, Ling Dong-Xiong (凌东雄)a, Zhang Shao-Qiang (张绍强)a, Zhu Xing (朱兴)b, He Ying-Ji (何影记)c
a College of Electronic Engineering, Dongguan University of Technology, Dongguan 523808, China; b State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275, China; c School of Electronics and Information, Guangdong Polytechnic Normal University, Guangzhou 510665, China
Abstract A theory is presented to investigate the existence and propagation stability of gap solitons in a parity-time (PT) complex superlattice with dual periods. In this superlattice, the real and imaginary parts are both in the form of superlattices with dual periods. In the self-focusing nonlinearity, PT solitons can exist in the semi-infinite gap. However, only those gap solitons with low powers can propagate stably, whereas the high-power solitons present periodic oscillation and simultaneously suffer energy decay. In the self-defocusing nonlinearity, PT solitons only exist in the first gap and all these solitons are stable.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61308019) and the Foundation for Distinguished Young Talents in Higher Education of Guangdong Province, China (Grant No. Yq2013157).
Corresponding Authors:
Wang Hong-Cheng
E-mail: hc_wang@126.com
Cite this article:
Wang Hong-Cheng (王红成), Ling Dong-Xiong (凌东雄), Zhang Shao-Qiang (张绍强), Zhu Xing (朱兴), He Ying-Ji (何影记) Gap solitons in parity–time complex superlattice with dual periods 2014 Chin. Phys. B 23 064208
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