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Green's function method to the ground state properties of a two-component Bose–Einstein condensate
2011
Low temperature physics (Woodbury, N.Y., Print)
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The elementary excitation spectrum of a two-component Bose-Einstein condensate is obtained by Green's function method. It is found to have two branches. In the long-wave limit, the two branches of the excitation spectrum are reduced to one phonon excitation and one single-particle excitation. With the obtained excitation spectrum and the Green's functions, the depletion of the condensate and the ground state energy have also been calculated in this paper.
doi:10.1063/1.3633685
fatcat:m7azgs2lyjfanpmtwr5vnwws4m