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Query: journal id: "physicalxreviewxb"

AuthorsM. Snoek, I. Titvinidze, W. Hofstetter
TitleCanted antiferromagnetic order of imbalanced Fermi-Fermi mixtures in optical lattices by dynamical mean-field theory
JournalPhysical Review B
Volume83
Year2011
Issue5
Pages6
ISSN10980121
FacultyFaculty of Science
Institute/dept.FNWI: Institute for Theoretical Physics (ITF)
AbstractWe investigate antiferromagnetic order of repulsively interacting fermionic atoms in an optical lattice by means of dynamical mean-field theory (DMFT). Special attention is paid to the case of an imbalanced mixture. We take into account the presence of an underlying harmonic trap, both in a local-density approximation and by performing full real-space DMFT calculations. We consider the case in which the particle density in the trap center is at half-filling, leading to an antiferromagnetic region in the center, surrounded by a Fermi liquid region at the edge. In the case of an imbalanced mixture, the antiferromagnetism is directed perpendicular to the ferromagnetic polarization and canted. We pay special attention to the boundary structure between the antiferromagnetic and the Fermi liquid phase. For the moderately strong interactions considered here, no Stoner instability toward a ferromagnetic phase is found. Phase separation is only observed for strong imbalance and sufficiently large repulsion.
Document typeArticle
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