Dark and bright solitons for a three-dimensional Gross-Pitaevskii equation with distributed time-dependent coefficients in the Bose-Einstein condensation. (February 2017)

• Record Type: Journal Article
• Authors: Liu, Lei; Tian, Bo; Zhen, Hui-Ling; Wu, Xiao-Yu; Shan, Wen-Rui
• Is Part Of: Superlattices and microstructures. Volume 102(2017)
• Page Start: 498
• Page End: 511
• Publication Date: 2017-02
• Subjects: Three-dimensional Gross-Pitaevskii equation -- Bose-Einstein condensation -- Soliton solutions -- Symbolic computation -- Hirota method; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2017.01.005
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: Under investigation in this paper is a three-dimensional Gross-Pitaevskii equation with the distributed time-dependent coefficients, which describes the phenomena associated with the three-dimensional Bose-Einstein condensation. Under the constraint α ( t ) = 2 β ( t ), we obtain the bilinear forms, dark and bright N -soliton solutions via the Hirota method and symbolic computation, where t is the scaled time, α ( t ) and β ( t ) are the coefficients for the strength of the quadratic potential and diffraction, respectively. Specially, compared with the bright soliton solutions previously reported, we eliminate one constraint and obtain more soliton parameters. We give the existence constraints of the dark and bright N solitons, respectively. Choosing the diffraction and gain/loss coefficients, we observe the growth, decay, periodic oscillation, periodic collapse and revival of the dark and bright solitons. Relationships between the BEC time-dependent coefficients and soliton properties are studied. With the help of the asymptotic and graphic analysis, elastic interactions of the dark and bright two solitons are exhibited. Highlights: Under the constraint α(t) = 2β(t), we obtain the bilinear forms and constructe dark and bright N -soliton solutions for a three-dimensional Gross-Pitaevskii equation with the distributed time-dependent coefficients. For this equation, we give the existence constraints of the dark N solitons and bright N solitons. With the help of the analytic and graphic analysis, we detailedly present the relationships between the BEC time-dependent coefficients and soliton properties. We study the elastic interactions of the dark and bright two solitons.