Antiferromagnetic noise correlations in optical lattices

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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

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
OriginalsprogEngelsk
TidsskriftPhysical Review A (Atomic, Molecular and Optical Physics)
Vol/bind80
Udgave nummer3
Sider (fra-til)033622
Antal sider5
ISSN2469-9926
DOI
StatusUdgivet - 23 sep. 2009

ID: 14829140