Antiferromagnetic noise correlations in optical lattices
arXiv:0907.0652 · doi:10.1103/PhysRevA.80.033622
Abstract
We analyze how noise correlations probed by time-of-flight (TOF) experiments reveal antiferromagnetic (AF) correlations of fermionic atoms in two-dimensional (2D) and three-dimensional (3D) optical lattices. Combining analytical and quantum Monte Carlo (QMC) calculations using experimentally realistic parameters, we show that AF correlations can be detected for temperatures above and below the critical temperature for AF ordering. It is demonstrated that spin-resolved noise correlations yield important information about the spin ordering. Finally, we show how to extract the spin correlation length and the related critical exponent of the AF transition from the noise.
4 pages, 4 figures
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- Magnetic phases of mass- and population-imbalanced ultracold fermionic mixtures in optical lattices
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- Coexistence of density wave and superfluid order in a dipolar Fermi gas
- Adiabatic spin-dependent momentum transfer in an SU(N) degenerate Fermi gas
- The imbalanced antiferromagnet in an optical lattice
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- Time-of-flight imaging method to observe signatures of antiferromagnetically ordered states of fermionic atoms in an optical lattice
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- Inducing spin-dependent tunneling to probe magnetic correlations in optical lattices
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