Bubbles with Attached Quantum Vortices in Trapped Binary Bose–Einstein Condensates

Specific topological excitations of energetically stable “core-and-mantle” configurations trapped two-component immiscible Bose–Einstein condensates are studied numerically within the coupled Gross–Pitaevskii equations. Nonstationary long-lived coherent structures, that consist several quantum vortex filaments penetrating “mantle” from outside to inside and vice versa demonstrate quite nontrivial dynamics, observed in simulations for first time. The ends can remain attached interface between “core” if latter is large enough while surface tension not small. shapes such “bubbles” strongly affected by vortices sometimes far being spherical.