The Peierls-Hubbard model at weak coupling

Details The Peierls-Hubbard model at weak coupling The Peierls-Hubbard model at weak coupling

2005-04-04

arxiv.org/abs/cond-mat/0504078v2

J. Phys.: Condens. Matter 17 (2005) 2663-2670

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures

Scientific paper

10.1088/0953-8984/17/17/014

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 g_c = 0.689348 below which the Hubbard interaction enhances the dimerization.

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