The European Physical Journal B - Condensed Matter and Complex Systems

, Volume 36, Issue 1, pp 65–73

Ground state features of the Fröhlich model

Authors

    • Coherentia-INFM and Dipartimento di Scienze Fisiche, Universitá degli Studi di Napoli “Federico II”Complesso Universitario Monte Sant’Angelo
  • V. Cataudella
    • Coherentia-INFM and Dipartimento di Scienze Fisiche, Universitá degli Studi di Napoli “Federico II”Complesso Universitario Monte Sant’Angelo
  • V. Marigliano Ramaglia
    • Coherentia-INFM and Dipartimento di Scienze Fisiche, Universitá degli Studi di Napoli “Federico II”Complesso Universitario Monte Sant’Angelo
  • C. A. Perroni
    • Coherentia-INFM and Dipartimento di Scienze Fisiche, Universitá degli Studi di Napoli “Federico II”Complesso Universitario Monte Sant’Angelo
  • D. Bercioux
    • Coherentia-INFM and Dipartimento di Scienze Fisiche, Universitá degli Studi di Napoli “Federico II”Complesso Universitario Monte Sant’Angelo
Article

DOI: 10.1140/epjb/e2003-00317-x

Cite this article as:
Filippis, G.D., Cataudella, V., Marigliano Ramaglia, V. et al. Eur. Phys. J. B (2003) 36: 65. doi:10.1140/epjb/e2003-00317-x

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 state spectral weight and the electron-lattice correlation function are calculated and successfully compared with the best available results.

Copyright information

© Springer-Verlag Berlin/Heidelberg 2003