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

Year: 2018

Authors: Tononi A.; Cappellaro A.; Salasnich L.

Autors Affiliation: Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Via Marzolo 8, I-35131 Padua, Italy; Univ Padua, CNISM, Via Marzolo 8, I-35131 Padua, Italy; CNR, INO, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy

Abstract: 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.


Volume: 20      Pages from: 125007-1  to: 125007-13

KeyWords: Bose-Einstein condensation; superfluidity; finite-range interaction; quantum field-theory; ultracold atoms
DOI: 10.1088/1367-2630/aaf75e

Citations: 11
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