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Chin. Phys. B, 2017, Vol. 26(10): 100304    DOI: 10.1088/1674-1056/26/10/100304
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Moving bright solitons in a pseudo-spin polarization Bose-Einstein condensate

Tian-Fu Xu(徐天赋)1, Yu-Feng Zhang(张玉峰)1, Lei-Chao Xu(许磊超)1, Zai-Dong Li(李再东)2,3
1. School of Science, Yanshan University, Qinhuangdao 066004, China;
2. Department of Applied Physics, Hebei University of Technology, Tianjin 300401, China;
3. Key Laboratory of Electronic Materials and Devices of Tianjin, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, China
Abstract  We study the moving bright solitons in the weak attractive Bose-Einstein condensate with a spin-orbit interaction. By solving the coupled nonlinear Schrödinger equation with the variational method and the imaginary time evolution method, two kinds of solitons (plane wave soliton and stripe solitons) are found in different parameter regions. It is shown that the soliton speed dominates its structure. The detuning between the Raman beam and energy states of the atoms decides the spin polarization strength of the system. The soliton dynamics is also studied for various moving speed and we find that the shape of individual components can be kept when the speed of soliton is low.
Keywords:  moving bright solitons      spin-orbit interaction  
Received:  18 April 2017      Revised:  19 June 2017      Published:  05 October 2017
PACS:  03.75.Lm (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)  
  67.85.-d (Ultracold gases, trapped gases)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11304270, 61774001, and 11475144) and the Key Project of Scientific and Technological Research of Hebei Province, China (Grant No. ZD2015133).
Corresponding Authors:  Tian-Fu Xu, Zai-Dong Li     E-mail:  tfxu@ysu.edu.cn;lizd@hebut.edu.cn

Cite this article: 

Tian-Fu Xu(徐天赋), Yu-Feng Zhang(张玉峰), Lei-Chao Xu(许磊超), Zai-Dong Li(李再东) Moving bright solitons in a pseudo-spin polarization Bose-Einstein condensate 2017 Chin. Phys. B 26 100304

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