Advantages of mass-imbalanced ultracold fermionic mixtures for approaching quantum magnetism in optical lattices

Sotnikov, Andrii, Cocks, Daniel, and Hofstetter, Walter (2012) Advantages of mass-imbalanced ultracold fermionic mixtures for approaching quantum magnetism in optical lattices. Physical Review Letters , 109. 065301. pp. 1-5.

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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.

Item ID: 34727
Item Type: Article (Research - C1)
ISSN: 1079-7114
Funders: German Science Foundation (DFG)
Projects and Grants: DFG Forschergruppe FOR 801, DFG Sonderforschungsbereich SFB-TR/49
Date Deposited: 24 Sep 2014 05:01
FoR Codes: 02 PHYSICAL SCIENCES > 0206 Quantum Physics > 020601 Degenerate Quantum Gases and Atom Optics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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