Magnetic solitons in spinor Bose-Einstein condensates

Magnetic solitons, a novel type of vector soliton in spinor Bose-Einstein condensates (BECs), have drawn considerable attention recently, as their existence depends crucially on the antiferromagnetic spin-dependent contact interaction. Here we demonstrate that the SO(3) symmetry of the underlying spinor gas allows interactions of solitons with different spin polarization [1], and intriguing collisional properties are observed in numerical simulations, including rotation and dissipation of soliton spin polarization. Moreover, we extend the study of magnetic solitons to the ferromagnetic case [2]. Characteristics of magnetic solitons with ferromagnetic interaction are identified and a proposal for experimental generation is given. [1] Chai, X., Lao, D., Fujimoto, K., & Raman, C. (2021). Magnetic soliton: from two to three components with SO (3) symmetry. Physical Review Research, 3(1), L012003. [2] Chai, X., You, L., & Raman, C. (2020). Magnetic solitons in an immiscible two-component Bose-Einstein condensate. arXiv preprint arXiv:2011.11462.