Antiferromagnetic noise correlations in optical lattices
KTH/Nordita/SU seminar in Theoretical Physics [before December 2013]
Wednesday 16 December 2009
to 12:00 at
Georg M. Bruun (Lund/NBI)
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.