Proville, L.; Aubry, S. - In: The European Physical Journal B - Condensed Matter and … 11 (1999) 1, pp. 41-58
The spatially localized bound states of two electrons in the adiabatic two-dimensional Holstein-Hubbard model on a square lattice are investigated both numerically and analytically. The interplay between the electron-phonon coupling g, which tends to form bipolarons and the repulsive Hubbard...