Affordable Access

Publisher Website

Perturbative expansion using a variational phonon basis for the Holstein model

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
126
Issue
3
Identifiers
DOI: 10.1016/s0038-1098(03)00035-8
Keywords
  • D. Electron–Phonon Interactions
  • E. Holstein Model
  • E. Perturbation Study

Abstract

Abstract A simple variational displacement phonon basis, obtained through the modified Lang–Firsov (MLF) transformation, is proposed to study the Holstein model. This phonon basis contains only one variational parameter, but capable of describing lattice distortions at distant sites from the charge carrier. A perturbation method based on this MLF basis is employed to calculate the single-electron ground-state energy and the dispersion of the polaronic band. The ground-state ( k=0) energy obtained up to the second-order perturbation within this approach agrees well with the available numerical results for the entire range of coupling strength.

There are no comments yet on this publication. Be the first to share your thoughts.