Journal article

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

  • Tincani, L. Fachbereich Physik, Philipps Universität Marburg,Germany
  • Noack, R. M. Fachbereich Physik, Philipps Universität Marburg,Germany
  • Baeriswyl, Dionys Département de Physique, Université de Fribourg, Switzerland
Published in:
  • Physical Review B. - 2009, vol. 79, no. 16, p. 165109
English 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.
Faculté des sciences et de médecine
Département de Physique
  • English
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