Magnetization-induced reordering of ground states phase diagram in a two-component Bose-Hubbard model
Phys. Rev. B 113, 075132 – Published 13 February, 2026
DOI: https://doi.org/10.1103/z78x-bd1k
Abstract
We investigate the influence of nonzero magnetization on the ground state phase diagram of the two-component Bose-Hubbard model. Employing a mean-field theoretical framework both analytically and numerically, we demonstrate that the positions and sizes of specific phases on the diagram are magnetization dependent. In particular, nonzero magnetization introduces different Mott insulator phase boundaries for each of the two components. This effect leads to the emergence of a hybrid phase characterized by the coexistence of a superfluid in one of the components and a Mott insulator in the other one. Our findings highlight the important role of conserved quantities, which is magnetization here, in reshaping the phase landscape, significantly influencing the stability and emergence of distinct quantum phases.
