Orbital order of spinless fermions near an optical Feshbach resonance

• Main Authors: Hauke, Philipp, Zhao, Erhai, Goyal, Krittika, Deutsch, Ivan H., Liu, W. Vincent, Lewenstein, Maciej
• Format: Text
• Language: unknown
• Published: arXiv 2011
• Subjects: Quantum Gases cond-mat.quant-gas; Strongly Correlated Electrons cond-mat.str-el; FOS Physical sciences; IPY
• Online Access: https://dx.doi.org/10.48550/arxiv.1103.5964; https://arxiv.org/abs/1103.5964

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