Tincani, L. Noack, R. M. Baeriswyl, Dionys 2009-04-17 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. application/pdf https://folia.unifr.ch/global/documents/301193 https://folia.unifr.ch/documents/301193/files/baeriswyl_cpb.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.79.165109 info:eu-repo/semantics/openAccess License undefined Physical Review B. - 2009, vol. 79, no. 16, p. 165109 critical points Hubbard model Ising model Kosterlitz-Thouless transition metal-insulator transition renormalisation info:eu-repo/classification/udc/53 Critical properties of the band-insulator-to-Mott-insulator transition in the strong-coupling limit of the ionic Hubbard model http://purl.org/coar/resource_type/c_6501