Band insulator to Mott insulator transition in a bilayer Hubbard model

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.75.193103· OSTI ID:936534

Kancharla, Srivenkateswara S ^[1]; Okamoto, Satoshi ^[1]

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1. ORNL

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.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 936534
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 19 Vol. 75
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COULOMB FIELD
ELECTRICAL INSULATORS
GROUND STATES
HUBBARD MODEL
PHASE DIAGRAMS
PHASE TRANSFORMATIONS