Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-08-17
Condens. Matter Phys., 2005, vol. 8, No. 4(44), p. 825-834
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 7 figures, submitted to Condensed Matter Physics journal
Scientific paper
The influence of external magnetic field $h$ on a static conductivity of Mott-Hubbard material which is described by model with correlated hopping of electrons has been investigated. By means of canonical transformation the effective Hamiltonian which takes into account strong intra-site Coulomb repulsion and correlated hopping is obtained. Using a variant of generalized Hartree-Fock approximation the single-electron Green function and quasiparticle energy spectrum of the model have been calculated. The static conductivity $\sigma$ has been calculated as a function of $h$, electron concentration $n$ and temperature $T$. The correlated hopping is shown to cause the electron-hole asymmetry of transport properties of narrow band materials.
Didukh Leonid
Dovhopyaty Yu.
Kramar Oleksandr
Skorenkyy Yu.
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