- Tytuł:
- On the Anharmonic Polaronic Model
- Autorzy:
- Konior, J.
- Powiązania:
- https://bibliotekanauki.pl/articles/1923721.pdf
- Data publikacji:
- 1992-11
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
71.38.+i
74.20.-z
33.10.Cs - Opis:
- 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.
- Źródło:
-
Acta Physica Polonica A; 1992, 82, 5; 773-776
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł