Perturbation theory for the one-dimensional optical polaron

Details Perturbation theory for the one-dimensional optical polaron Perturbation theory for the one-dimensional optical polaron

2001-02-02

arxiv.org/abs/cond-mat/0102040v1

Phys. Rev. B 63, 153405 (2001)

Physics

Condensed Matter

9 pages, 2 figures, RevTeX, to be published in Phys. Rev. B (2001) Apr

Scientific paper

10.1103/PhysRevB.63.153405

The one-dimensional optical polaron is treated on the basis of the perturbation theory in the weak coupling limit. A special matrix diagrammatic technique is developed. It is shown how to evaluate all terms of the perturbation theory for the ground-state energy of a polaron to any order by means of this technique. The ground-state energy is calculated up to the eighth order of the perturbation theory. The effective mass of an electron is obtained up to the sixth order of the perturbation theory. The radius of convergence of the obtained series is estimated. The obtained results are compared with the results from the Feynman polaron theory.

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