Comparison of variational and CSE methods to polaron ground-state energy
Other Condensed Matter
2007-05-23 v1
Abstract
Taking the same trial wave function, the ground-state energy of Fr\"{o}hlich polaron is investigated by variational method and coherent-state expansion (CSE) one, respectively. Within the accuracy to (the electron-phonon coupling constant), both methods can give the same analytic expressions of polaron ground-state energy as the function of electron-phonon coupling constant. We find that the CSE method can much simplify the calculation and shows more advantages in higher order approximations.
Cite
@article{arxiv.cond-mat/0412515,
title = {Comparison of variational and CSE methods to polaron ground-state energy},
author = {Qing Chen and Ke-Lin Wang and Yi Wang},
journal= {arXiv preprint arXiv:cond-mat/0412515},
year = {2007}
}
Comments
6 pages, no figure