Abstract
Via the Hirota bilinear method combined with the Kadomtsev–Petviashvili (KP) hierarchy reduction method, two types of solitons, namely general solitons on a background of periodic waves and rational soliton solutions, to the parity-time-symmetric nonlocal nonlinear Schrödinger equation with the defocusing-type nonlinearity for nonzero boundary condition are investigated. These two types of soliton solutions are constructed by constraining the tau functions of single-component KP hierarchy satisfying the dimension reduction and the nonlocal symmetry and the complex conjugated conditions. For the solitons on a background of periodic waves, we first construct the periodic solution to provide the background of periodic waves and then combine the periodic solution with general soliton solution, which generate solitons on a background of periodic waves. For the rational solitons, we mainly investigate the dynamical behaviours of interactions between several individual rational dark–antidark solitons, antidark–antidark solitons, and antidark–dark solitons, which are elastic collisions with no phase shift. The degenerated soliton cases are also discussed, in which only one-antidark soliton survives.
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Acknowledgements
The authors would like to thank Prof. D. Zuo of USTC for his fruitful suggestions. The work of J. He was supported by the National Natural Science Foundation of China (Grant 12071304) and Shenzhen Science and Technology Program (Grant No. RCBS20200714114922203).The work of J. Rao was supported by the Guangdong Basic and Applied Basic Research Foundation (Grant 2019A1515110208). The work of Y. Cheng was supported by the National Natural Science Foundation of China (Grant 11871446).
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Rao, J., He, J., Mihalache, D. et al. On general solitons in the parity-time-symmetric defocusing nonlinear Schrödinger equation. Z. Angew. Math. Phys. 72, 65 (2021). https://doi.org/10.1007/s00033-021-01487-w
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DOI: https://doi.org/10.1007/s00033-021-01487-w
Keywords
- Nonlocal parity-time-symmetric nonlinear Schrödinger equation
- Rational soliton solutions
- Hirota’s bilinear method
- KP hierarchy reduction method