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- W2045820211 abstract "It is known that elementary bosons condense in a unique state, not so much because this state has the lowest free-particle energy but because it costs a macroscopic amount of energy to put the particles into different states which can then interact through quantum particle exchanges. Since individual exchanges between the two fermions of a composite boson are ignored when composite particles are replaced by elementary bosons, it is of importance to reconsider the exchange-energy argument for the stability of the Bose-Einstein condensate in the case of composite bosons. We do this here in the light of the new many-body theory which allows us to take exactly into account all possible exchanges between the fermionic components of the composite bosons. We confirm that the condensate of composite bosons occupies a single state, this state being moreover pure: a coherent superposition of states close in energy is shown to be less favorable for both elementary and composite bosons." @default.
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- W2045820211 date "2008-10-27" @default.
- W2045820211 modified "2023-09-30" @default.
- W2045820211 title "Stability of a Bose-Einstein condensate revisited for composite bosons" @default.
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- W2045820211 doi "https://doi.org/10.1103/physrevb.78.144303" @default.
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