Phys. Rev. B 69, 041101(R) (2004) [4 pages]Charge dynamics in the Mott insulating phase of the ionic Hubbard model
I extend to charge and bond operators the transformation that maps the ionic Hubbard model at half filling onto an effective spin Hamiltonian. Using the transformed operators I calculate the amplitude of the charge-density wave in different dimensions D. In one dimension, the charge-charge correlations at large distance d decay as d-3ln-3/2d, in spite of the finite charge gap, due to remaining charge-spin coupling. Bond-bond correlations decay as (-1)dd-1ln-3/2d as in the usual Hubbard model. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.041101
DOI:
10.1103/PhysRevB.69.041101
PACS:
71.45.Lr, 75.10.Jm, 77.80.-e, 71.30.+h
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