  We construct explicit examples of microscopic models that stabilize a variety
of fractionalized phases of strongly correlated systems in spatial dimension
bigger than one, and in zero external magnetic field. These include models of
charge fractionalization in boson-only systems, and various kinds of
spin-charge separation in electronic systems. We determine the excitation
spectrum and show the consistency with that expected from field theoretic
descriptions of fractionalization. Our results are further substantiated by
direct numerical calculation of the phase diagram of one of the models.

Superconductivity;Strongly Correlated Electrons