Condensation and superfluidity of dilute Bose gases with finite-range interaction

We investigate an ultracold and dilute Bose gas by taking into account a finite-range two-body interaction. The coupling constants of the resulting Lagrangian density are related to measurable scattering parameters by following the effective-field-theory approach. A perturbative scheme is then devel...

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Bibliographic Details
Published in:New Journal of Physics
Main Authors: A Tononi, A Cappellaro, L Salasnich
Format: Article
Language:English
Published: IOP Publishing 2018-01-01
Subjects:
Bose–Einstein condensation
superfluidity
finite-range interaction
quantum field-theory
ultracold atoms
Online Access:https://doi.org/10.1088/1367-2630/aaf75e
Description
Summary:We investigate an ultracold and dilute Bose gas by taking into account a finite-range two-body interaction. The coupling constants of the resulting Lagrangian density are related to measurable scattering parameters by following the effective-field-theory approach. A perturbative scheme is then developed up to the Gaussian level, where both quantum and thermal fluctuations are crucially affected by finite-range corrections. In particular, the relation between spontaneous symmetry breaking and the onset of superfluidity is emphasized by recovering the renowned Landau’s equation for the superfluid density in terms of the condensate one.
ISSN:1367-2630

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