Finite temperature QMC study of the one-dimensional polarized Fermi gas

Authors :: Wolak, M. J.
Rousseau, V. G.
Miniatura, C.
Gremaud, B.
Scalettar, R. T.
Batrouni, G. G.
Source :: Phys. Rev. A 82, 013614 (2010)
Publication Year :: 2010
Abstract: Quantum Monte Carlo (QMC) techniques are used to provide an approximation-free investigation of the phases of the one-dimensional attractive Hubbard Hamiltonian in the presence of population imbalance. The temperature at which the "Fulde-Ferrell-Larkin-Ovchinnikov" (FFLO) phase is destroyed by thermal fluctuations is determined as a function of the polarization. It is shown that the presence of a confining potential does not dramatically alter the FFLO regime, and that recent experiments on trapped atomic gases likely lie just within the stable temperature range.<br />Comment: 10 pages, 13 figures We added a discussion of the behaviour of the FFLO peak as a function of the attractive interaction strength