Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-10-14
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 figures, Proceedings of LT25
Scientific paper
10.1088/1742-6596/150/4/042128
We investigate the ground-state properties of the one-dimensional two-band Hubbard model with different bandwidths. The density-matrix renormalization group method is applied to calculate the averaged electron occupancies $n$ as a function of the chemical potential $\mu$. Both at quarter and half fillings, "charge plateaux" appear in the $n$-$\mu$ plot, where $d\mu/dn$ diverges and the Mott insulating states are realized. To see how the orbital polarization in the one-quarter charge plateau develops, we apply the second-order perturbation theory from the strong-coupling limit at quarter filling. The resultant Kugel-Khomskii spin-orbital model includes a $magnetic$ field coupled to orbital pseudo-spins. This field originates from the discrepancy between the two bandwidths and leads to a finite orbital pseudo-spin magnetization.
Kawakami Norio
Koga Akihisa
Miyashita Satoshi
Yamashita Yasuhiro
Yonemitsu Kenji
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