Electronic phase transitions in the half-filled ionic Hubbard model

Abstract

A detailed study of electronic phase transitions in the ionic Hubbard model at half filling is presented. Within the dynamical mean field approximation a series of transitions from the band insulator via a metallic state to a Mott-Hubbard insulating phase is found at intermediate values of the one-body potential $\Delta$ with increasing the Coulomb interaction $U$. We obtain a critical region in which the metallic phase disappears and a {\it novel} coexistence phase between the band and the Mott insulating state sets in. Our results are consistent with those obtained at low dimensions, thus they provide a concrete description for the charge degrees of freedom of the ionic Hubbard model.

4 pages, 4 figures

References in corpus (16)

• A New Iterative Perturbation Scheme for Lattice Models with Arbitrary Filling
• From band insulator to Mott insulator in one dimension
• Can correlations drive a band insulator metallic?
• Dynamical Mean Field Theory with the Density Matrix Renormalization Group
• Quantum Monte Carlo Study of an Interaction-Driven Band Insulator to Metal Transition
• Correlation Induced Insulator to Metal Transitions
• Novel Phase Between Band and Mott Insulators in Two Dimensions
• Disorder Screening in Strongly Correlated Systems
• Metallic phase in the two-dimensional ionic Hubbard model
• From Mott Insulator to Band Insulator: A DMFT Study
• Breakdown of Luttinger's theorem in two-orbital Mott insulators
• Fourth-Order Perturbation Theory for the Half-Filled Hubbard Model in Infinite Dimensions
• Temperature-dependent electronic structure and ferromagnetism in the d=oo Hubbard model studied by a modfied perturbation theory
• Insulator-to-metal crossover induced by local spin fluctuations in strongly correlated systems
• Band-Insulator-Metal-Mott-Insulator transition in the half--filled $t-t^{\prime }$ ionic-Hubbard chain
• Spinless Two-Band Model in Infinite Dimensions

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