Variational solution of a superfluidity model

We derive, using the variational principle for the free energy, the solution of a model for superfluidity proposed in a previous paper. The solution has the phase diagram and the excitation spectrum expected from a superfluid. We draw the attention to the fact that the model is obtained, as compared...

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Bibliographic Details
Published inPhysica A Vol. 216; no. 4; pp. 386 - 396
Main Authors Angelescu, N., Verbeure, A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.1995
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Summary:We derive, using the variational principle for the free energy, the solution of a model for superfluidity proposed in a previous paper. The solution has the phase diagram and the excitation spectrum expected from a superfluid. We draw the attention to the fact that the model is obtained, as compared with the Bogoliubov model, by a milder suppressing of interactions with the zero mode fluctuations, leading to the good spectral properties of superfluidity.
ISSN:0378-4371
1873-2119
DOI:10.1016/0378-4371(95)00078-L