Mott insulating phases and magnetism of fermions in a double-well optical lattice

Details Mott insulating phases and magnetism of fermions in a double-well optical lattice Mott insulating phases and magnetism of fermions in a double-well optical lattice

2011-08-22

arxiv.org/abs/1108.4409v2

Phys. Rev. A 84, 061603(R) (2011)

Physics

Condensed Matter

Quantum Gases

5 pages, 3 figures

Scientific paper

10.1103/PhysRevA.84.061603

We theoretically investigate, using non-perturbative strong correlation techniques, Mott insulating phases and magnetic ordering of two-component fermions in a two-dimensional double-well optical lattice. At filling of two fermions per site, there are two types of Mott insulators, one of which is characterized by spin-1 antiferromagnetism below the Neel temperature. The super-exchange interaction in this system is induced by the interplay between the inter-band interaction and the spin degree of freedom. A great advantage of the double-well optical lattice is that the magnetic quantum phase diagram and the Neel temperature can be easily controlled by tuning the orbital energy splitting of the two-level system. Particularly, the Neel temperature can be one order of magnitude larger than that in standard optical lattices, facilitating the experimental search for magnetic ordering in optical lattice systems.

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