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Paper detail

The two-orbital Hubbard model and the OSMT

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.

preprint2009arXivOpen access
Adolfo AvellaFerdinando ManciniSatoru OdashimaGiovanni Scelza
cond-mat.str-el
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Adolfo AvellaFerdinando ManciniSatoru OdashimaGiovanni Scelza

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