Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 50: Ultra-cold atoms, ions and BEC VI (with Q)

A 50.3: Vortrag

Freitag, 21. März 2014, 11:00–11:15, BEBEL E34

Magnetic ordering in three-component ultracold fermionic mixtures in optical lattices — •Andrii Sotnikov and Walter Hofstetter — Goethe Universität, Frankfurt am Main, Germany

We study finite-temperature magnetic phases of three-component mixtures of ultracold fermions with repulsive interactions in optical lattices by means of dynamical mean-field theory (DMFT). We focus on the case of one particle per site (1/3 band filling) at moderate interaction strength, where we observe a transition between different sublattice orderings by means of the unrestricted real-space generalization of DMFT.

Our simulations show that long-range ordering in three-component mixtures should be observable at temperatures comparable to those in two-component mixtures. We analyse different types of antiferromagnetic order (2- and 3-sublattice color-density waves, color-selective antiferromagnetism) and determine the critical temperatures for transitions between different phases. We also discuss the effect of the asymmetry in interspecies interactions on these magnetic phases and the corresponding critical temperatures.