Journal
PHYSICAL REVIEW A
Volume 100, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.100.063636
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Funding
- Spanish Ministry of Science, Innovation, and Universities
- European Regional Development Fund FEDER [PGC2018-101355-B-I00]
- Basque Government [IT986-16]
- Fondazione CR Firenze through project SUPERACI-Superfluid Atomic Circuits
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We consider a homogeneous heteronuclear Bose mixture with contact interactions at the mean-field collapse, i.e., with interspecies attraction equal to the mean geometrical intraspecies repulsion. We show that the Lee-Huang-Yang (LHY) energy functional is accurately approximated by an expression that has the same functional form as in the homonuclear case. The approximated energy functional is characterized by two exponents, which can be treated as fitting parameters. We demonstrate that the values of these parameters which preserve the invariance under permutation of the two atomic species are exactly those of the homonuclear case. Deviations from the exact expression of the LHY energy functional are discussed quantitatively and a specific application is described.
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