The Peierls-Hubbard model at weak coupling
Michael Dzierzawa, Carmen Mocanu
Abstract
We investigate the Peierls transition in the one-dimensional Peierls-Hubbard model at half filling in the adiabatic approximation for the lattice. Depending on the value of the electron-lattice coupling constant g the equilibrium dimerization can be either enhanced or suppressed by the Hubbard interaction U. Applying second order perturbation theory we determine the critical value gc = 0.689348 below which the Hubbard interaction enhances the dimerization.
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