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Superfluid and insulating phases of fermion mixtures in optical lattices
The ground state phase diagram of fermion mixtures in optical lattices is
analyzed as a function of interaction strength, fermion filling factor and
tunneling parameters. In addition to standard superfluid, phase-separated or
coexisting superfluid/excess-fermion phases found in homogeneous or
harmonically trapped systems, fermions in optical lattices have several
insulating phases, including a molecular Bose-Mott insulator (BMI), a
Fermi-Pauli (band) insulator (FPI), a phase-separated BMI/FPI mixture or a
Bose-Fermi checkerboard (BFC). The molecular BMI phase is the fermion mixture
counterpart of the atomic BMI found in atomic Bose systems, the BFC or BMI/FPI
phases exist in Bose-Fermi mixtures, and lastly the FPI phase is particular to
the Fermi nature of the constituent atoms of the mixture.Comment: 4 pages with 3 figures (Published version
Coexistence of Antiferromagnetism and Triplet Superconductivity
The authors discuss the possibility of coexistence of antiferromagnetism and
triplet superconductivity as a particular example of a broad class of systems
where the interplay of magnetism and superconductivity is important. This paper
focuses on the case of quasi-one-dimensional metals, where it is known
experimentally that antiferromagnetism is in close proximity to triplet
superconductivity in the temperature versus pressure phase diagram. Over a
narrow range of pressures, the authors propose an intermediate non-uniform
phase consisting of alternating insulating antiferromagnetic and triplet
superonducting stripes.Comment: 9 pages, 3 figures. 2004 Conference of Magnetism and Magnetic
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