The two-orbital Hubbard model and the OSMT

Details The two-orbital Hubbard model and the OSMT The two-orbital Hubbard model and the OSMT

2009-03-09

arxiv.org/abs/0903.1544v2

Physica C 460-462, 1068 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 1 figure

Scientific paper

We analyze the two-orbital Hubbard model by means of the Composite Operator Method with the aim at studying the phenomenon of orbital selective Mott transition (OSMT). The model contains an interorbital interaction $U'$, in addition to the usual intraorbital one $U$. As warming-up approximation, we use a basis of two operators only, the Hubbard operators. The analysis of the density of states at the chemical potential as a function of the ratio between the bandwidths of the two orbitals shows the clear signature of an orbital selective Mott transition as expected.

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