Premium
The Ordering Types in the Extended Hubbard Model with Electron—Phonon Interaction
Author(s) -
Manakova L. A.,
Ionov S. P.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221210129
Subject(s) - bipolaron , polaron , condensed matter physics , ground state , hubbard model , electron , phonon , lattice (music) , physics , homogeneous , quantum mechanics , superconductivity , statistical physics , acoustics
The ground states in the extended Hubbard model are obtained taking into account polaron effects, with both, intrasite repulsion and intrasite attraction. It is shown that the function f q , characterizing the degree of lattice polarization due to the electron—phonon interaction depends on the type of the ground state and on the electron concentration. Depending on the interaction parameters, the hopping energy (the bandwidth), and the electron concentration the crystals can be in the following ground states: 1. the polaron charge‐ordered state; 2. the bipolaron chargeordered state; 3. the bipolaron state with a homogeneous electron distribution over the lattice; 4. the state with an intersite bipolaron.