Hannover 2013 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
A: Fachverband Atomphysik
A 29: Poster: Ultra-cold atoms, ions and BEC (with Q)
A 29.9: Poster
Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof
Quantum magnetism of mass-imbalanced fermionic mixtures — •Andrii Sotnikov1, Daniel Cocks1, Michiel Snoek2, and Walter Hofstetter1 — 1Goethe Universität, Frankfurt am Main, Germany — 2Universiteit van Amsterdam, The Netherlands
We study magnetic phases of two-component mixtures of ultracold fermions with repulsive interactions in optical lattices in the presence of hopping and population imbalance by means of dynamical mean-field theory (DMFT). According to our analysis, mass-imbalanced mixtures have important advantages over balanced systems in thermodynamic characteristics that are relevant for obtaining and detecting quantum magnetism in optical lattices.
It is shown that mixtures with both imbalances present can have easy-axis antiferromagnetic, ferrimagnetic, charge-density wave, canted-antiferromagnetic order or be unordered depending on parameters of the system. We study the resulting phase diagram in detail and investigate the stability of the phases to thermal fluctuations. We also perform a quantitative analysis for a gas confined in a harmonic trap, by applying the local density approximation and a real-space generalization of DMFT.