Abstract
The one-dimensional SSH Hamiltonian supplemented by an on-site Coulomb interaction is investigated using the Gutzwiller Ansatz. The various expectation values for the correlated ground state are evaluated numerically (Hubbard-Stratonovich transformation and Monte Carlo simulation). Within the parameter region studied, the lattice dimerization (for the half-filled band) has lower energy than the spin-density wave ground state. Preliminary results for charged and neutral solitons show that these two inhomogeneous configurations are more and more distinct, both in size and energy, as the Hubbard parameter U increases.
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