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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

Metallic phase in the two-dimensional ionic Hubbard model

Résumé

We investigate the phases of the ionic Hubbard model in a two-dimensional square lattice using determinant quantum Monte Carlo. At half-filling, when the interaction strength or the staggered potential dominates, we find Mott and band insulators, respectively. When these two energies are of the same order, we find a metallic region. Charge and magnetic structure factors demonstrate the presence of antiferromagnetism only in the Mott region, although the externally imposed density modulation is present everywhere in the phase diagram. Away from half-filling, other insulating phases are found. Kinetic energy correlations do not give clear signals for the existence of a bond-ordered phase.

Dates et versions

hal-00257896 , version 1 (20-02-2008)

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Citer

Karem Bouadim, N. Paris, Frederic Hebert, G. G. Batrouni, R. T. Scalettar. Metallic phase in the two-dimensional ionic Hubbard model. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 76 (8), pp.085112. ⟨10.1103/PhysRevB.76.085112⟩. ⟨hal-00257896⟩
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