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RESEARCH PRODUCT
Fermion pairing with spin-density imbalance in an optical lattice
T. K. KoponenLars Melwyn JensenJani-petri MartikainenJami J. KinnunenPäivi Törmäsubject
PhysicsCondensed Matter::Quantum GasesOptical latticeCondensed Matter - Materials ScienceCondensed matter physicsCondensed Matter - SuperconductivityGeneral Physics and AstronomyMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesFermion01 natural sciences114 Physical sciences010305 fluids & plasmasMomentumSuperfluiditySuperconductivity (cond-mat.supr-con)PairingCondensed Matter::Superconductivity0103 physical sciencesCooper pair010306 general physicsFermi gasTranslational symmetrydescription
We consider pairing in a two-component atomic Fermi gas, in a three-dimensional optical lattice, when the components have unequal densities, i.e. the gas is polarized. We show that a superfluid where the translational symmetry is broken by a finite Cooper pair momentum, namely an FFLO-type state, minimizes the Helmholtz free energy of the system. We demonstrate that such a state is clearly visible in the observable momentum distribution of the atoms, and analyze the dependence of the order parameter and the momentum distribution on the filling fraction and the interaction strength.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-05-07 |