English

Two-site two-electron Holstein model: a perturbation study

Condensed Matter 2007-05-23 v2

Abstract

The two-site two-electron Holstein model is studied within a perturbation method based on a variational phonon basis obtained through the modified Lang-Firsov (MLF) transformation. The ground-state wave function and the energy are found out considering up to the seventh and eighth order of perturbation, respectively. The convergence of the perturbation corrections of different orders to the ground state energy as well as to different correlation functions are investigated. The kinetic energy and the correlation functions involving charge and lattice deformations are studied as a function of electron-phonon (ee-ph) coupling for different values of adiabaticity parameter and Coulomb repulsion. The simultaneous effect of the ee-ph coupling and Coulomb repulsion on the kinetic energy shows interesting features.

Keywords

Cite

@article{arxiv.cond-mat/0210607,
  title  = {Two-site two-electron Holstein model: a perturbation study},
  author = {Jayita Chatterjee and A. N. Das},
  journal= {arXiv preprint arXiv:cond-mat/0210607},
  year   = {2007}
}

Comments

Latex, 12 figures, revised version