Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders

Details Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders

2008-09-09

arxiv.org/abs/0809.1539v2

Phys.Rev.Lett.102:076403,2009

Physics

Condensed Matter

Strongly Correlated Electrons

To appear in Phys. Rev. Lett.; minor revisions

Scientific paper

10.1103/PhysRevLett.102.076403

We study the pair correlations of a spin-imbalanced two-leg ladder with attractive interactions, using the density matrix renormalization group method (DMRG). We identify regions in the phase diagram spanned by the chemical potential and the magnetic field that can harbor Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like physics. Results for the pair structure factor, exhibiting multiple pairing wave-vectors, substantiate the presence of FFLO-like correlations. We further discuss phase separation scenarios induced by a harmonic trap, which differ from the case of isolated chains.

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