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1992 | 82 | 5 | 773-776
Article title

On the Anharmonic Polaronic Model

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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.
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EN
Publisher

Year
Volume
82
Issue
5
Pages
773-776
Physical description
Dates
published
1992-11
Contributors
author
  • Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
References
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Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv82z513kz
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