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

Abstract

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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• Fermi surfaces and Luttinger's theorem in paired fermion systems
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• Population imbalanced fermions in harmonically trapped optical lattices
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Cited by in corpus (11)

• Matrix product ansatz for Fermi fields in one dimension
• Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices
• Dimer, trimer and FFLO liquids in mass- and spin-imbalanced trapped binary mixtures in one dimension
• Exotic paired states with anisotropic spin-dependent Fermi surfaces
• Interaction quantum quenches in the one-dimensional Fermi-Hubbard model with spin imbalance
• Ground states and dynamics of population-imbalanced Fermi condensates in one dimension
• Exotic paired phases in ladders with spin-dependent hopping
• Quantum Coherent States of Interacting Bose-Fermi Mixtures in One Dimension
• Cooling schemes for two-component fermions in layered optical lattices
• Incompressible states of a two-component Fermi gas in a double-well optical lattice
• Dimensional crossover on multileg attractive-$U$ Hubbard ladders