Band insulator to Mott insulator transition in a bilayer Hubbard model

Details Band insulator to Mott insulator transition in a bilayer Hubbard model Band insulator to Mott insulator transition in a bilayer Hubbard model

2007-03-27

arxiv.org/abs/cond-mat/0703728v1

Phys. Rev. B 75, 193103 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages; 5 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.75.193103

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.

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