We study a spinless two-band model at half filling in the limit of inf
inite dimensions. The ground state of this model in the noninteracting
limit is a band insulator. We identify transitions to a metal and to
a charge Mott insulator, using a combination of analytical, quantum Mo
nte Carlo, and zero temperature recursion methods. The metallic phase
is a non-Fermi-liquid state with algebraic local correlation functions
with universal exponents over a range of parameters.