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Antiferromagnetic noise correlations in optical lattices
  KTH/Nordita/SU seminar in Theoretical Physics [before December 2013]

Wednesday 16 December 2009
from 11:00 to 12:00
at FA31
Speaker : Georg M. Bruun (Lund/NBI)
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.

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