Magnetic solitons in a ferromagnetic spinor Bose-Einstein condensate

Vector solitons, which are solitary waves occurring in multicomponent nonlinear media, can transport spin. In antiferromagnetic spin-1 Bose-Einstein condensates (BECs), the recently studied magnetic solitons feature themselves as a localized spin excitation traveling upon a balanced m=±1 condensate. In this work [1], we propose magnetic solitons in spinor Bose gas with ferromagnetic interaction, which in contrast, manifest themselves as a local spin-flip propagating on top of a spin-polarized background. We show that the existence of such solitons depends crucially on the ferromagnetic interaction and compare their properties with that of the well-known dark-bright solitons. Collisions between magnetic solitons in ferromagnetic spinor gas display intriguing features including bound state formation. A protocol for realizing such solitons in a ⁸⁷Rb BEC is proposed for future experimental exploration. [1] Chai, X., You, L., & Raman, C. (2022). Magnetic solitons in an immiscible two-component Bose-Einstein condensate. Physical Review A, 105(1), 013313.