Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.86.023630
Title: Pairing in a two-dimensional Fermi gas with population imbalance
Authors: Wolak, M.J.
Grémaud, B. 
Scalettar, R.T.
Batrouni, G.G.
Issue Date: 23-Aug-2012
Citation: Wolak, M.J., Grémaud, B., Scalettar, R.T., Batrouni, G.G. (2012-08-23). Pairing in a two-dimensional Fermi gas with population imbalance. Physical Review A - Atomic, Molecular, and Optical Physics 86 (2) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.86.023630
Abstract: Pairing in a population-imbalanced Fermi system in a two-dimensional optical lattice is studied using determinant quantum Monte Carlo simulations and mean-field calculations. The approximation-free numerical results show a wide range of stability of the Fulde-Ferrell-Larkin-Ovchinnikov phase. Contrary to claims of fragility with increased dimensionality, we find that this phase is stable across a wide range of values for the polarization, temperature, and interaction strength. Both homogeneous and harmonically trapped systems display pairing with finite center-of-mass momentum, with clear signatures either in momentum space or real space, which could be observed in cold-atomic gases loaded in an optical lattice. We also use the harmonic level basis in the confined system and find that pairs can form between particles occupying different levels, which can be seen as the analog of the finite center-of-mass momentum pairing in the translationally invariant case. Finally, we perform mean-field calculations for the uniform and confined systems and show the results to be in good agreement with quantum Monte Carlo. This leads to a simple picture of the different pairing mechanisms, depending on the filling and confining potential. © 2012 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/116507
ISSN: 10502947
DOI: 10.1103/PhysRevA.86.023630
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