Cold Attractive Spin Polarized Fermi Lattice Gases and the Doped Positive U Hubbard Model
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966-1200 (United States)
- Department of Physics, University of California, Santa Barbara, California 93106-9530 (United States)
Experiments on polarized fermion gases performed by trapping ultracold atoms in optical lattices allow the study of an attractive Hubbard model for which the strength of the on-site interaction is tuned by means of a Feshbach resonance. Using a well-known particle-hole transformation we discuss how results obtained for this system can be reinterpreted in the context of a doped repulsive Hubbard model. In particular, we show that the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state corresponds to the striped state of the two-dimensional doped positive U Hubbard model. We then use the results of numerical studies of the striped state to relate the periodicity of the FFLO state to the spin polarization. We also comment on the relationship of the d{sub x{sup 2}}{sub -y{sup 2}} superconducting phase of the doped 2D repulsive Hubbard model to a d-wave spin density wave state for the attractive case.
- OSTI ID:
- 20951402
- Journal Information:
- Physical Review Letters, Vol. 98, Issue 21; Other Information: DOI: 10.1103/PhysRevLett.98.216402; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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