Phase transitions and spectral properties of the ionic Hubbard model in one dimension

Details Phase transitions and spectral properties of the ionic Hubbard model in one dimension Phase transitions and spectral properties of the ionic Hubbard model in one dimension

2011-11-04

arxiv.org/abs/1111.1119v1

Phys. Rev. B 84, 195102 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 8 figures

Scientific paper

10.1103/PhysRevB.84.195102

The ionic Hubbard model is investigated at half filling at zero temperature. We apply the cellular dynamical mean-field theory to the one-dimensional ionic Hubbard model to compute local quantities such as double occupancy and staggered charge density. Both quantities provide general transition behavior of the model from a band insulating phase to a Mott insulating phase. The renormalized band gap is introduced as an efficient order parameter for the transition from a band insulator. We also present the spectral properties of the ionic Hubbard model, which exhibit characteristic features for both weak and strong interactions.

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