https://doi.org/10.1140/epjb/e2003-00317-x
Ground state features of the Fröhlich model
Coherentia-INFM and Dipartimento di Scienze Fisiche,
Università degli Studi di Napoli “Federico II”,
Complesso Universitario Monte Sant'Angelo,
Via Cintia, 80126 Napoli, Italy
Corresponding author: a giuliode@na.infn.it
Received:
2
July
2003
Published online:
19
November
2003
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 state spectral weight and the electron-lattice correlation function are calculated and successfully compared with the best available results.
PACS: 71.38.Fp – Large or Fröhlich polarons
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
