Cellular dynamical mean-field theory for the one-dimensional ionic Hubbard model

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Abstract

We study the ionic Hubbard model in one dimension at zero temperature. As the Hubbard interaction is increased, the system is known to evolve from a band insulator to a Mott insulator. In order to examine the transition nature, we perform a cellular dynamical mean-field calculation with an exact diagonalization technique employed as an impurity solver. From the computed local density of states, we estimate the spectral gap as the interaction strength is varied. We also calculate the spectral weight, which exhibits characteristic features for different phases.

Original languageEnglish
Pages (from-to)1006-1009
Number of pages4
JournalJournal of the Korean Physical Society
Volume53
Issue number2 PART 1
DOIs
StatePublished - Aug 2008

Keywords

  • Cellular dynamical mean-field theory
  • Ionic hubbard model

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