Superfluid to Mott insulator quantum phase transition in a 2D permanent magnetic lattice Saeed Ghanbari, P. Blair Blakie, Peter Hannaford and Tien D. Kieu Eur. Phys. J. B, 70 3 (2009) 305-310 Published online: 26 June 2009 DOI: 10.1140/epjb/e2009-00210-8