Density-Wave and Antiferromagnetic States of Fermionic Atoms in Optical Lattices

Details Density-Wave and Antiferromagnetic States of Fermionic Atoms in Optical Lattices Density-Wave and Antiferromagnetic States of Fermionic Atoms in Optical Lattices

2009-01-22

arxiv.org/abs/0901.3555v2

Phys. Rev. A 79, 023607 (2009)

Physics

Condensed Matter

Other Condensed Matter

7 pages, 7 figures

Scientific paper

10.1103/PhysRevA.79.023607

We study the two-band effects on ultracold fermionic atoms in optical lattices by means of dynamical mean-field theory. We find that at half-filling the atomic-density-wave (ADW) state emerges owing to the two-band effects in the attractive interaction region, while the antiferromagnetic state appears in the repulsive interaction region. As the orbital splitting is increased, the quantum phase transitions from the ADW state to the superfluid state and from the antiferromagnetic state to the metallic state occur in respective regions. Systematically changing the orbital splitting and the interaction, we obtain the phase diagram at half-filling. The results are discussed using the effective boson model derived for the strong attractive interaction.

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