2002/10/28 by Jayita Chatterjee, Chatterjee, Jayita, A. N. Das +1
Physics and Astronomy · #Advanced Chemical Physics Studies #Condensed Matter (cond-mat) #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/0210607
Latex, 12 figures, revised version
openalex publication_date 2002/10/28 · arxiv created 2002/11/22 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 (e-ph) coupling for different values of adiabaticity parameter and Coulomb repulsion. The simultaneous effect of the e-ph coupling and Coulomb repulsion on the kinetic energy shows interesting features.