6533b870fe1ef96bd12d066f
RESEARCH PRODUCT
BCS-BEC Crossover in Atomic Fermi Gases with a Narrow Resonance
Lars Melwyn JensenLars Melwyn JensenH. M. NilsenG. Watanabesubject
PhysicsCondensed Matter::Quantum GasesRange (particle radiation)Strongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsNuclear TheoryCondensed Matter - SuperconductivityCrossoverFOS: Physical sciencesBCS theoryTwo-body problemResonance (particle physics)Atomic and Molecular Physics and OpticsSuperconductivity (cond-mat.supr-con)Nuclear Theory (nucl-th)MomentumCondensed Matter - Strongly Correlated ElectronsScattering theoryFermi gasdescription
We determine the effects on the BCS-BEC crossover of the energy dependence of the effective two-body interaction, which at low energies is determined by the effective range. To describe interactions with an effective range of either sign, we consider a single-channel model with a two-body interaction having an attractive square well and a repulsive square barrier. We investigate the two-body scattering properties of the model, and then solve the Eagles-Leggett equations for the zero temperature crossover, determining the momentum dependent gap and the chemical potential self-consistently. From this we investigate the dependence of the crossover on the effective range of the interaction.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-04-05 |