On the Anharmonic Polaronic Model

• Authors: J. Konior
• Languages of publication: EN

Abstracts

EN

Anharmonic polaronic model is considered. The model consists of the electronic subsystem, described within the extended Hubbard model, coupled to anharmonic local phonons. By the canonical Holstein-Lang-Firsov transformation the electron-phonon interaction term is ruled out and, then, the effective electronic Hamiltonian is obtained by averaging over the ground state of the phononic subsystem. It is shown that anharmonicity introduces two main additional factors as compared with the harmonic case. First, the band narrowing factor is less rapidly decaying function of the electron-phonon interaction strength. Second, anharmonicity introduces further renormalization of the on- and intersite interaction between fermions.

Keywords

EN

71.38.+i; 74.20.-z; 33.10.Cs

Discipline

• 74.20.-z: Theories and models of superconducting state

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1992
• Volume: 82
• Issue: 5
• Pages: 773-776

Dates

published

1992-11

Contributors

author

J. Konior

• Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

Identifiers

DOI

10.12693/APhysPolA.82.773