Orbital order of spinless fermions near an optical Feshbach resonance

• Published in: Physical Review A
• Main Authors: Hauke, Philipp, Zhao, Erhai, Goyal, Krittika, Deutsch, Ivan H., Liu, W. Vincent, Lewenstein, Maciej
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2011
• Subjects: IPY
• Online Access: http://hdl.handle.net/11572/252200; https://doi.org/10.1103/PhysRevA.84.051603; https://journals.aps.org/pra/abstract/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 phases with "axial orbital order" in which p z and px+ipy (or px-ipy) orbitals alternate. © 2011 American Physical Society.