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(-3) ln(-3/2)d, in spite of the finite charge gap, due to remaining charge-spin coupling. Bond-bond correlations decay as (-1)(d)d(-1) ln(-3/2)d as in the usual Hubbard model.
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