Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: MLT: Poster Session
TT 37.10: Poster
Donnerstag, 25. März 2010, 14:00–18:00, Poster A
Canted Antiferromagnetic Order of Imbalanced Fermi-Fermi Mixtures in Optical Lattices: a Dynamical Mean-Field Perspective — •Irakli Titvinidze1, Michiel Snoek2, and Walter Hofstetter1 — 1Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60438 Frankfurt am Main, Germany — 2Institute for Theoretical Physics, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands
We investigate antiferromagnetic order of repulsively interacting fermionic atoms in two- and three-dimensional optical lattices by means of Dynamical Mean-Field Theory. Special attention is paid to the case of an imbalanced mixture, in which case the antiferromagnetism is canted, i.e. the staggered component perpendicular to the applied field. We take into account the presence of the underlying harmonic trap, both within a local density approximation and by performing full Real-Space DMFT [1] calculations. No Stoner instability towards a ferromagnetic phase is found. Phase separation is only observed for large repulsion and strong imbalance.