ABSTRACT: Correlation of squeezing and displacement variational parameters of phonons is shown to enhance the e ective electron-phonon coupling constant when compared with the uncorrelated case. The correlation supresses all quantum e ects of phonons: the quantum reduction of the polaron sel ocalization, of the Debye-Waller factor and of the increase of the soliton (quantum Holstein polaron) wi...

The operator method is used to construct the solutions of the problem of the polaron in the strong coupling limit and of the helium atom on the basis of the Hartree–Fock equation. E0 = −0.108 512 8052α2 is obtained for the polaron ground-state energy. Energies for 2s and 3s states are also calculated. The other excited states are briefly discussed.

The field-effect mobility of hole polarons in α-sexithiophene, measured in thin film transistors, was shown to be well fitted by Holstein’s small polaron theory. Unfortunately, Holstein’s formulation is based on an integral that does not converge. We show that the data are well fitted by a theory of polaron transport that was successful in accounting for mobility in molecular crystals

Electron-lattice interactions are often considered not to play a major role in material’s properties as they are assumed to be small, the second-order effects. This study, however, shows the importance of taking these effects into account in the simulations. My results demonstrate the impact of the electron-lattice interaction on the physics of the material and our understanding from it. One wa...

We investigated temperature dependent optical conductivity spectra of La7/8Sr1/8MnO3. Its phonon bending mode starts to be splitted near a structural phase transition temperature. With further cooling, strength of a midinfrared small polaron peak, which is located at 0.4 eV, becomes increased. These temperature dependent changes in the phonon spectra and the polaron absorption peaks were explai...