title: Advantages of mass-imbalanced ultracold fermionic mixtures for approaching quantum magnetism in optical lattices.
abstract: We study magnetic phases of two-component mixtures of ultracold fermions with repulsive interactions in optical lattices in the presence of hopping imbalance. Our analysis is based on dynamical mean-field theory (DMFT) and its real-space generalization at finite temperature. We study the temperature dependence of the transition into the ordered state as a function of the interaction strength and the imbalance parameter in two and three spatial dimensions. We show that below the critical temperature for Néel order mass-imbalanced mixtures also exhibit a charge-density wave, which provides a directly observable signature of the ordered state. For the trapped system, we compare our results obtained by real-space DMFT to a local-density approximation. We calculate the entropy for a wide range of parameters and identify regions, in which mass-imbalanced mixtures could have clear advantages over balanced ones for the purpose of obtaining and detecting quantum magnetism.
authors.affiliation: Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt/Main, Germany.
authors.forename: Andrii
authors.initials: A
authors.lastname: Sotnikov
authors.forename: Daniel
authors.initials: D
authors.lastname: Cocks
authors.forename: Walter
authors.initials: W
authors.lastname: Hofstetter