Ground-state phase diagram of two-component interacting bosons on a two-leg ladder

Using the cluster Gutzwiller mean-field method, we numerically study the ground-state phase diagram of the non-hard-core two-component interacting bosons trapped in a two-leg ladder with and without an artificial magnetic field. Interestingly, several loophole supercounterfluid (SCF) phases are observed at a sufficiently small intra- to inter-leg hopping ratio when the magnetic flux is absent. While if the ratio is not too small, the loophole SCF phases can be induced by the effect of the magnetic flux as well. Additionally, we also find that the presence of the magnetic flux leads to an enlargement of the Mott insulator lobe and the conventional SCF lobe. We hope these results can improve the understanding of the interplay between lattice gases, gauge fields, and bosonic ladder systems.Comment: 9 pages, 5 figure