1302.3395 (K. Makuch et al.)

Thermodynamic properties of correlated fermions in lattices with
spin-dependent disorder    [PDF]

K. Makuch, J. Skolimowski, P. B. Chakraborty, K. Byczuk, D. Vollhardt

Motivated by the rapidly growing possibilities for experiments with ultracold atoms in optical lattices we investigate the thermodynamic properties of correlated lattice fermions in the presence of an external spin-dependent random potential. The corresponding model, a Hubbard model with spin-dependent local random potentials, is solved within dynamical mean-field theory. This allows us to present a comprehensive picture of the thermodynamic properties of this system. In particular, we show that for a fixed total number of fermions spin-dependent disorder induces a magnetic polarization. The magnetic response of the polarized system differs from that of a system with conventional disorder.

View original: http://arxiv.org/abs/1302.3395