Fermion pairing with spin-density imbalance in an optical lattice

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http://hdl.handle.net/10138/166270

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Koponen , T , Kinnunen , J , Martikainen , J-P , Jensen , L M & Törmä , P 2006 , ' Fermion pairing with spin-density imbalance in an optical lattice ' , New Journal of Physics , vol. 8 , no. 179 . https://doi.org/10.1088/1367-2630/8/9/179

Title: Fermion pairing with spin-density imbalance in an optical lattice
Author: Koponen, T; Kinnunen, J; Martikainen, Jani-Petri; Jensen, L. M; Törmä, P
Date: 2006
Language: eng
Number of pages: 18
Belongs to series: New Journal of Physics
ISSN: 1367-2630
URI: http://hdl.handle.net/10138/166270
Abstract: 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.
Subject: 114 Physical sciences
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