Antiferromagnetic Order of Repulsively Interacting Fermions on Optical lattices
arXiv:0903.5265 · doi:10.1103/PhysRevA.80.033603
Abstract
The Néel state in fermionic mixtures of two pseudospin species in an optical lattice is analyzed at low temperatures. Experimentally it remains a challenge to demonstrate antiferromagnetic correlations in ultracold fermionic quantum gases. We find that, while in balanced systems the Néel order parameter can point in any spatial direction, in imbalanced mixtures antiferromagnetism is strictly perpendicular to the quantization axis (i.e., the z-axis). Since, experimentally, one always has to assume some minimal imbalance this should have important consequences for ongoing experiments.
4 pages, 3 figures
References in corpus (10)
- Many-Body Physics with Ultracold Gases
- Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
- Deformation of a Trapped Fermi Gas with Unequal Spin Populations
- Formation of spatial shell structures in the superfluid to Mott insulator transition
- Antiferromagnetic Order of Strongly Interacting Fermions in a Trap: Real-Space Dynamical Mean-Field Analysis
- Interference pattern and visibility of a Mott insulator
- Mott transition of fermionic atoms in a three-dimensional optical trap
- Probing spatial spin correlations of ultracold gases by quantum noise spectroscopy
- Magnetic and superfluid phases of confined fermions in two-dimensional optical lattices
- Population imbalanced fermions in harmonically trapped optical lattices