Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-12-11
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 8 figures, to appear in J. Phys. Soc. Jpn., Vol.78, No.12, p.124706
Scientific paper
10.1143/JPSJ.78.124706
We investigate the electronic states of a one-dimensional two-orbital Hubbard model with band splitting by the exact diagonalization method. The Luttinger liquid parameter $K_{\rho}$ is calculated to obtain superconducting (SC) phase diagram as a function of on-site interactions: the intra- and inter-orbital Coulomb $U$ and $U'$, the Hund coupling $J$, and the pair transfer $J'$. In this model, electron and hole Fermi pockets are produced when the Fermi level crosses both the upper and lower orbital bands. We find that the system shows two types of SC phases, the SC \Roman{u'-large} for $U>U'$ and the SC \Roman{u-large} for $U
Ono Yoshiaki
Sano Kazuhiro
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