Insulating behavior with spin and charge order in the ionic Hubbard model
arXiv:0902.1076 · doi:10.1103/PhysRevB.79.121103
Abstract
Paramagnetic solutions of the ionic Hubbard model at half-filling in dimensions indicate that the band and the Mott insulator phases are separated by a metallic phase. We present zero-temperature dynamical mean-field theory solutions, which include antiferromagnetic long-range order, and show that the one-particle spectral functions always possess an energy gap and therefore the system is insulating for all interaction strengths. The staggered charge density modulation coexists with antiferromagnetic long-range order of Néel type.
4 pages, 4 figures
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