Ercelebi, A.Senger, R. T.2016-02-082016-02-0819940953-8984http://hdl.handle.net/11693/26004The 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.EnglishBound polaronElectron phonon couplingExtrapolationThree dimensional polaronsTwo dimensional polaronsElectron energy levelsElectronsInterpolationMathematical modelsPerturbation techniquesPhononsThree dimensionalVariational techniquesElementary particlesArticle10.1088/0953-8984/6/28/019