Superfuid-insulator transitions at non-integer filling in optical lattices of fermionic atoms

Details Superfuid-insulator transitions at non-integer filling in optical lattices of fermionic atoms Superfuid-insulator transitions at non-integer filling in optical lattices of fermionic atoms

2007-06-22

arxiv.org/abs/0706.3417v2

Phys. Rev. A 77, 011601(R) (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures, submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.77.011601

We determine the superfluid transition temperatures $T_c$ and the ground states of the attractive Hubbard model and find new insulating phases associated with non-integer filling at sufficiently strong pairing attraction $|U|$. These states, distinct from band and Mott insulating phases, derive from pair localization; pair hopping at large $|U|$ and high densities is impeded by inter-site, inter-pair repulsive interactions. The best way to detect the breakdown of superfluidity is using fermionic optical lattices which should reveal new forms of ``bosonic'' order, reflecting ground state pairing without condensation.

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