2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18448Bogoliubov-de Gennes (BdG) equations and the excitation spectrum of a two-component Bose-Einstein condensate (BEC) are derived with an arbitrary interaction between bosons, including long-range and short range forces. The nonconverting BEC mixture segregates into two phases for some two-body interactions. Gross-Pitaevskii (GP) equations are solved for the phase segregated BEC. A possibility of boundary-surface and other localised excitations is studied.9 pages, 2 figuresSoft Condensed MatterSuperconductivitytext