Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders
Strongly Correlated Electrons
2009-03-12 v2 Superconductivity
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.
Keywords
Cite
@article{arxiv.0809.1539,
title = {Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders},
author = {A. E. Feiguin and F. Heidrich-Meisner},
journal= {arXiv preprint arXiv:0809.1539},
year = {2009}
}
Comments
To appear in Phys. Rev. Lett.; minor revisions