Study of the temperature dependence of single-particle and pair coherent condensate densities for a Bose liquid with a "depleted" single-particle Bose-Einstein condensate (BEC) at $T \neq 0$

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dc.creatorPashitskii, E.
dc.creatorVilchynskyy, S.
dc.date2004-09-19
dc.date.accessioned2026-07-07T03:00:54Z
dc.date.available2026-07-07T03:00:54Z
dc.descriptionWe study the temperature dependence of single-particle and pair coherent condensate densities for a Bose liquid with a "depleted" single-particle Bose-Einstein condensate (BEC) at $T \neq 0$. Our investigations were based on the field-theoretical Green's functions. On the basis of the use of empirical data about the speeds of the first and second sounds is described superfluid state at $T \neq 0$. It is studied the structure of superfluid state taking into account appearance with the different from zero temperatures of normal component and taking into account the branch of the second sound, whose speed approaches zero at $T \to T_λ$. The bare interaction between bosons was chosen in the form of a repulsive Azis potential, the Fourier component of which was an oscillatory and sign-varying function of the momentum. The obtained temperature dependence of single-particle and pair coherent condensate and total densities has a good agreement with experiment data.
dc.description11 pages, 2 figures, LaTeX 2e
dc.identifierhttps://arxiv.org/abs/cond-mat/0409488
dc.identifierhttp://arxiv.org/abs/cond-mat/0409488
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24901
dc.subjectOther Condensed Matter
dc.titleStudy of the temperature dependence of single-particle and pair coherent condensate densities for a Bose liquid with a "depleted" single-particle Bose-Einstein condensate (BEC) at $T \neq 0$
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