  We establish the connection between the presence of a glass phase and the
appearance of a Coulomb gap in disordered materials with strongly interacting
electrons. Treating multiparticle correlations in a systematic way, we show
that in the case of strong disorder a continuous glass transition takes place
whose Landau expansion is identical to that of the Sherrington-Kirkpatrick spin
glass. We show that the marginal stability of the glass phase controls the
physics of these systems: it results in slow dynamics and leads to the
formation of a Coulomb gap.
