Orbital order of spinless fermions near an optical Feshbach resonance

Details Orbital order of spinless fermions near an optical Feshbach resonance Orbital order of spinless fermions near an optical Feshbach resonance

2011-03-30

arxiv.org/abs/1103.5964v2

Phys. Rev. A 84, 051603(R) (2011)

Physics

Condensed Matter

Quantum Gases

4+epsilon pages, 3 figures. Similar to version published in PRA(R)

Scientific paper

10.1103/PhysRevA.84.051603

We study the quantum phases of a three-color Hubbard model that arises in the dynamics of the p-band orbitals of spinless fermions in an optical lattice. Strong, color-dependent interactions are induced by an optical Feshbach resonance. Starting from the microscopic scattering properties of ultracold atoms, we derive the orbital exchange constants at 1/3 filling on the cubic optical lattice. Using this, we compute the phase diagram in a Gutzwiller ansatz. We find novel phases with 'axial orbital order' in which pz and px + ipy (or px - ipy) orbitals alternate.

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