  We study the effect of parametric excitations on systems of confined
ultracold Bose atoms in periodically modulated optical lattices. In the regime
where Mott insulating and Superfluid domains coexist, we show that the
dependence of the energy absorbed by the system on the frequency of the
modulation serves as an experimental probe for the existence and properties of
Mott insulating-Superfluid domains.

Other Condensed Matter