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Ground state features of the Fröhlich model

Filippis, G. ; Cataudella, V. ; Perroni, C. ; Ramaglia, V. ; Bercioux, D.

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Abstract

Following the ideas behind the Feynman approach, a variational wave function is proposed for the Fröhlich model. It is shown that it provides, for any value of the electron-phonon coupling constant, an estimate of the polaron ground state energy better than the Feynman method based on path integrals. The mean number of phonons, the average electronic kinetic and interaction energies, the ground ...

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