Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-12-11
Phys. Rev. A 78, 013637 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 4 figures
Scientific paper
10.1103/PhysRevA.78.013637
We explore the pairing properties of the one-dimensional attractive Hubbard model in the presence of finite spin polarization. The correlation exponents for the most important fluctuations are determined as a function of the density and the polarization. We find that in a system with spin population imbalance, Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-type pairing at wavevector Q=|k_{F,\uparrow}-k_{F,\downarrow}| is always dominant and there is no Chandrasekhar-Clogston limit. We then investigate the case of weakly coupled 1D systems and determine the region of stability of the 1D FFLO phase. This picture is corroborated by density-matrix-renormalization-group (DMRG) simulations of the spatial noise correlations in uniform and trapped systems, unambiguously revealing the presence of fermion pairs with nonzero momentum Q. This opens up an interesting possibility for experimental studies of FFLO states.
Laeuchli Andreas
Luscher Andreas
Noack Reinhard M.
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