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Under investigation in this article is the integrable spin-1 Gross–Pitaevskii (SGP) equations, which can be used to describe light transmission in bimodal nonlinear optical fibres. The spectral analysis with 4 × 4 Lax pairs is performed for the integrable SGP equations, from which a Riemann Hilbert problem is formulated. Furthermore,  N -soliton solutions of this integrable SGP equations are expressed in terms of solutions of the Riemann–Hilbert problem by using the Plemelj formulae. Finally, collision dynamics between two solitons is also analyzed. Our results can be used to enrich and explain some related nonlinear phenomena.

Riemann–Hilbert Problem and Multi-Soliton Solutions of the Integrable Spin-1 Gross–Pitaevskii Equations