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

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

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Strongly Correlated Electrons, Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/222938

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0809.1539
 http://arxiv.org/abs/0809.1539
 Phys.Rev.Lett.102:076403,2009
 doi:10.1103/PhysRevLett.102.076403

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arXiv