Publication Type
Journal
Journal Name
Physical Review B
Publication Date
Page Number
193103
Volume
75
Issue
19
Abstract
The ground state phase diagram of the half-filled repulsive Hubbard
model in a bilayer is investigated using cluster dynamical mean field
theory. For weak to intermediate values of Coulomb repulsion U, the
system undergoes a transition from a Mott insulating phase to a
metallic phase and then onto a band insulating phase as the interlayer hopping is increased. In the strong coupling case, the model exhibits a direct
crossover from a Mott insulating phase to a band insulating
phase. These results are robust with respect to the presence or
absence of magnetic order.
