Conventional character of the BCS-BEC cross-over in ultra-cold gases of 40K

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dc.creatorSzymanska, Marzena H.
dc.creatorGoral, Krzysztof
dc.creatorKoehler, Thorsten
dc.creatorBurnett, Keith
dc.date2005-01-29
dc.date2005-07-20
dc.date.accessioned2026-07-07T12:37:42Z
dc.date.available2026-07-07T12:37:42Z
dc.descriptionWe use the standard fermionic and boson-fermion Hamiltonians to study the BCS-BEC cross-over near the 202 G resonance in a two-component mixture of fermionic 40K atoms employed in the experiment of C.A. Regal et al., Phys. Rev. Lett. 92, 040403 (2004). Our mean-field analysis of many-body equilibrium quantities shows virtually no differences between the predictions of the two approaches, provided they are both implemented in a manner that properly includes the effect of the highest excited bound state of the background scattering potential, rather than just the magnetic-field dependence of the scattering length. Consequently, we rule out the macroscopic occupation of the molecular field as a mechanism behind the fermionic pair condensation and show that the BCS-BEC cross-over in ultra-cold 40K gases can be analysed and understood on the same basis as in the conventional systems of solid state physics.
dc.description16 pages, 10 eps figures; final version
dc.identifierhttps://arxiv.org/abs/cond-mat/0501728
dc.identifierhttp://arxiv.org/abs/cond-mat/0501728
dc.identifierPhys.Rev.A72:013610,2005
dc.identifierdoi:10.1103/PhysRevA.72.013610
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218528
dc.subjectSuperconductivity
dc.subjectAtomic Physics
dc.titleConventional character of the BCS-BEC cross-over in ultra-cold gases of 40K
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