Utilizing the state dependent projection technique, we derive a formula for intraband transition linewidths due to longitudinal optical phonon scattering for the electrons in a triangular potential well. We find for GaN that the absorption power is keenly affected by the screening in such a way...

Phonon anomalies observed in various high T<Subscript>c</Subscript> cuprates are analyzed theoretically within the Hubbard-Holstein model in the limit of strong local electron correlations and in presence of long-range Coulomb interaction. The phonon self-energy is evaluated by taking into account the charge...</subscript>

Excitations of the polaron types are investigated in the spin-1/2 quantum chain with XY exchange and Dzyaloshinsky-Moriya interaction, both coupled to acoustic vibrations of the substrate lattice. The study is carried out via Jordan-Wigner transformation with the help of which the spin chain is...

Polaron effects on excitons in parabolic quantum wells are studied theoretically by using a variational approach with the so-called fractional dimension model. The numerical results for the exciton binding energies and longitudinal-optical phonon contributions in GaAs/Al<Subscript>0.3</Subscript>Ga<Subscript>0.7</Subscript>As parabolic...</subscript></subscript>

Phonon effects in tunnelling through a double quantum dot molecule are investigated by use of a recently developed technique, which is based on an exact mapping of a many-body electron-phonon interaction problem onto a multichannel one-body problem. The molecule is sandwiched between two ideal...

The translationally invariant diagrammatic quantum perturbation theory (TPT) is applied to the polaron problem on the 1D lattice, modeled through the Holstein Hamiltonian with the phonon frequency ω<Subscript>0</Subscript>, the electron hopping t and the electron-phonon coupling constant g. The self-energy diagrams...</subscript>