T Koponen et al 2006 New J. Phys. 8 179 doi:10.1088/1367-2630/8/9/179
Fermion pairing with spin-density imbalance in an optical lattice
Focus on Cold Atoms in Optical LatticesT Koponen1, J Kinnunen1, J-P Martikainen2, L M Jensen1 and P Törmä1
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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 a Fulde–Ferrel–Larkin–Ovchinnikov (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 analyse the dependence of the order parameter and the momentum distribution on the filling fraction and the interaction strength.
- PACS
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05.30.Fk Fermion systems and electron gas
05.50.+q Lattice theory and statistics (Ising, Potts, etc.)
- Subjects
- Dates
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Issue 9 (September 2006)
Received 7 May 2006
Published 5 September 2006
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Fermion pairing with spin-density imbalance in an optical lattice
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