Comparison of variational and CSE methods to polaron ground-state energy

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Taking the same trial wave function, the ground-state energy of Fröhlich polaron is investigated by variational method and coherent-state expansion (CSE) one, respectively. Within the accuracy to $α^{2}$(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.
6 pages, no figure

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Other Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/25523

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0412515
 http://arxiv.org/abs/cond-mat/0412515

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arXiv