Browsing by Subject "Electron phonon coupling"

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    Energy and mass of 3D and 2D polarons in the overall range of the electron-phonon coupling strength
    (Institute of Physics Publishing Ltd., 1994) Ercelebi, A.; Senger, R. T.
    The ground-state characterization of the polaron problem is retrieved within the framework of a variational scheme proposed previously by Devreese et al for the bound polaron. The formulation is based on the standard canonical transformation of the strong coupling ansatz and consists of a variationally determined perturbative extension serving for the theory to interpolate in the overall range of the coupling constant. Specializing our considerations to the bulk and strict two-dimensional polaron models we see that the theory yields significantly improved energy upper bounds in the strong coupling regime and, moreover, extrapolates itself successfully towards the well-established weak coupling limits for all polaron quantities of general interest.