Solitons in PT-symmetric periodic systems with the logarithmically saturable nonlinearity.
We report on the formation and stability of induced solitons in parity-time (PT) symmetric periodic systems with the logarithmically saturable nonlinearity. Both on-site and off-site lattice solitons exist for the self-focusing nonlinearity. The most intriguing result is that the above solitons can also be realized inside the several higher-order bands of the band structure, due to the change of nonlinear type with the soliton power. Stability analysis shows that on-site solitons are linearly stably, and off-site solitons are unstable in their existence domain.
College of Science, China University of Petroleum, Qingdao 266580, China.
Kaiyun
K
Zhan
Department of Physics, Harbin Institute of Technology, Harbin 150001, China.
Hao
H
Tian
College of Pipeline and civil engineering, China University of Petroleum, Qingdao 266580, China.
Xin
X
Li
College of Science, China University of Petroleum, Qingdao 266580, China.
Xianfeng
X
Xu
College of Science, China University of Petroleum, Qingdao 266580, China.
Zhiyong
Z
Jiao
College of Science, China University of Petroleum, Qingdao 266580, China.
Yulei
Y
Jia