Wetting phase transition of two segregated Bose–Einstein condensates restricted by a hard wall

• System of two segregated Bose–Einstein condensates limited by a wall is studied.
• Double-parabola approximation is applied to Gross–Pitaevskii theory.
• Interface tension and wetting phase diagram are established.

The wetting phase transition in the system of two segregated Bose–Einstein condensates (BECs) restricted by a hard wall is studied by means of the double-parabola approximation (DPA) applied to the Gross–Pitaevskii (GP) theory. We found the interfacial tension and the wetting phase diagram which depend weakly on the spatial restriction.