Critical properties of the band-insulator-to-Mott-insulator transition in the strong-coupling limit of the ionic Hubbard model

Abstract

We investigate the neutral-to-ionic insulator-insulator transition in one-dimensional materials by treating a strong-coupling effective model based on the ionic Hubbard model using the density-matrix renormalization group and finite-size scaling. The effective model, formulated in a spin-one representation, contains a single parameter. We carry out an extensive finite-size scaling analysis of the relevant gaps and susceptibilities to characterize the two zero-temperature transitions. We find that the transition from the ionic band-insulating phase to an intermediate spontaneously dimerized phase is Ising, and the transition from the dimerized phase to the Mott-insulating phase is Kosterlitz-Thouless, in agreement with the field-theory-based predictions.

13 pages, 12 figures

References in corpus (6)

• The density-matrix renormalization group
• Two-site entropy and quantum phase transitions in low-dimensional models
• Investigation of Quantum Phase Transitions using Multi-target DMRG Methods
• The dimerized phase of ionic Hubbard models
• Unified phase diagram of models exhibiting neutral-ionic transition
• Effective Hamiltonian for a Half-filled Hubbard Chain with Alternating On-site Interactions

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