Spin and charge ordering in the dimerized Hubbard model

We study the effect of a chemically or deformation-induced charge-density w ave on the spin-density-wave ground state of the Hubbard model at half-fill ing. We also consider the effect of a lattice deformation associated with a dimerization of the hopping term, thus introducing a competition with a pa ramagnetic bond-alternating phase. The slave-boson approach is used as an i nterpolation scheme to treat the electronic correlations from weak to stron g coupling and determine the phase diagram of the model. We also apply our results to describe the neutral-ionic transition in organic mixed-stack don or-acceptor crystals.