Antiferromagnetic noise correlations in optical lattices

Georg Morten Bruun, Niels Bohr International Academy, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark, F. T. Syljuåsen, K. G. L. Pedersen, Brian Møller Andersen, E. Demler, Anders Søndberg Sørensen

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Abstract

We analyze how noise correlations probed by time-of-flight experiments reveal antiferromagnetic (AF) correlations of fermionic atoms in two-dimensional and three-dimensional optical lattices. Combining analytical and quantum Monte Carlo 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
Udgivelsesdato: September 18
Original languageEnglish
JournalPhysical Review A (Atomic, Molecular and Optical Physics)
Volume80
Issue number3
Pages (from-to)033622
Number of pages5
ISSN2469-9926
DOIs
Publication statusPublished - 23 Sep 2009

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