Naoki Irikura, Yujiro Eto, Takuya Hirano, and *Hiroki Saito,

Ground-state phases of a mixture of spin-1 and spin-2 Bose-Einstein condensates,

Physical Review A 97, 023622/1-10 (2018).

[Summary] We investigate the ground-state phases of a mixture of spin-1 and spin-2 Bose-Einstein condensates at zero magnetic field. In addition to the intraspin interactions, two spin-dependent interaction coefficients are introduced to describe the interspin interaction. We systematically explore the wide parameter space, and obtain phase diagrams containing a rich variety of phases. For example, there exists a phase in which the spin-1 and spin-2 vectors are tilted relative to each other breaking the axial symmetry.