TY - JOUR
T1 - Fulde-Ferrell-Larkin-Ovchinnikov pairing in one-dimensional optical lattices
JF - Phys. Rev. B 77 (2008) 245105
Y1 - 2008
A1 - Matteo Rizzi
A1 - Marco Polini
A1 - Miguel A. Cazalilla
A1 - M.R. Bakhtiari
A1 - Mario P. Tosi
A1 - Rosario Fazio
AB - Spin-polarized attractive Fermi gases in one-dimensional (1D) optical lattices are expected to be remarkably good candidates for the observation of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. We model these systems with an attractive Hubbard model with population imbalance. By means of the density-matrix renormalization-group method we compute the pairing correlations as well as the static spin and charge structure factors in the whole range from weak to strong coupling. We demonstrate that pairing correlations exhibit quasi-long range order and oscillations at the wave number expected from FFLO theory. However, we also show by numerically computing the mixed spin-charge static structure factor that charge and spin degrees of freedom appear to be coupled already for small imbalance. We discuss the consequences of this coupling for the observation of the FFLO phase, as well as for the stabilization of the quasi-long range order into long-range order by coupling many identical 1D systems, as in quasi-1D optical lattices.
UR - http://hdl.handle.net/1963/2694
U1 - 1406
U2 - Physics
U3 - Condensed Matter Theory
ER -