Pairing states of a polarized Fermi gas trapped in a one-dimensional optical lattice

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dc.creatorFeiguin, A. E.
dc.creatorHeidrich-Meisner, F.
dc.date2007-07-27
dc.date2008-01-02
dc.date.accessioned2026-07-07T08:51:42Z
dc.date.available2026-07-07T08:51:42Z
dc.descriptionWe study the properties of a one-dimensional (1D) gas of fermions trapped in a lattice by means of the density matrix renormalization group method, focusing on the case of unequal spin populations, and strong attractive interaction. In the low density regime, the system phase-separates into a well defined superconducting core and a fully polarized metallic cloud surrounding it. We argue that the superconducting phase corresponds to a 1D analogue of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, with a quasi-condensate of tightly bound bosonic pairs with a finite center-of-mass momentum that scales linearly with the magnetization. In the large density limit, the system allows for four phases: in the core, we either find a Fock state of localized pairs or a metallic shell with free spin-down fermions moving in a fully filled background of spin-up fermions. As the magnetization increases, the Fock state disappears to give room for a metallic phase, with a partially polarized superconducting FFLO shell and a fully polarized metallic cloud surrounding the core.
dc.description4 pages, 5 figs
dc.identifierhttps://arxiv.org/abs/0707.4172
dc.identifierhttp://arxiv.org/abs/0707.4172
dc.identifierPhys. Rev. B 76, 220508(R) (2007)
dc.identifierdoi:10.1103/PhysRevB.76.220508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/145025
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titlePairing states of a polarized Fermi gas trapped in a one-dimensional optical lattice
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